Shop Birthday Cards at Onderkast Studio

Onderkast Studios Sprinkles and Wrinkles Wavy Die Cut Notecard features colorful sprinkles, playful “bring on the sprinkles AND WRINKLES happy birthday!” text, and comes with a white envelope—perfect for birthday celebrations.

$4.95

Sprinkles and Wrinkles Wavy Die Cut Notecard

Happy Birthday Cake Topper Greeting Card

$4.95

Happy Birthday Cake Topper Greeting Card

The Happy Birthday Sprinkle Cake Greeting Card by Onderkast Studio features a sprinkle cake with two Happy Birthday flags on a decorative stand, set against a light pink background for an elegant touch.

$4.95

Happy Birthday Sprinkle Cake Greeting Card

The Onderkast Studio Getting Old Bingo Greeting Card highlights funny signs of aging, such as joints popping and loud phones, with a Free Happy B-Day! Space at the center.

$4.95

Getting Old Bingo Greeting Card

Make a Wish Birthday Candles Greeting Card

$4.95

Make a Wish Birthday Candles Greeting Card

The Holy Shit You’re Ancient Dinosaur Greeting Card by Onderkast Studio features a cartoon dinosaur in party gear with the text holy shit YOURE ANCIENT—a funny milestone birthday card for anyone with a sense of humor!.

$4.95

Holy Shit You’re Ancient Dinosaur Greeting Card

The Onderkast Studio Happy Birthday Whiskey Bottle Greeting Card features a bottle labeled “Happy Birthday” with phrases like “Old Timer,” “Aged to Perfection,” and “Authentic,” shown resting on a crisp white envelope.

$4.95

Happy Birthday Whiskey Bottle Greeting Card

The Happy Bee-day! Greeting Card by Onderkast Studio features cute bee illustrations and swirly lines around the text on a white background, paired with a matching envelope for a premium touch.

$4.95

Happy Bee-day! Greeting Card

The Smack That Ass Piñata Greeting Card by Onderkast Studio features a donkey-shaped piñata with Smack that ASS! And have a SMASHING birthday! on a white background, surrounded by confetti and candies.

$4.95

Smack That Ass Piñata Greeting Card

The Aged to Perfection Wine Greeting Card by Onderkast Studio features a wine glass with a lit candle, confetti accents, and the message: Aged to Perfection! Cheers to you on your birthday!.

$4.95

Aged to Perfection Wine Greeting Card

Happy Birthday to You Cake + Candles Greeting Card

$4.95

Happy Birthday to You Cake + Candles Greeting Card

The Call Me Old Fashioned Cocktail Greeting Card by Onderkast Studio features an Old Fashioned with orange peel and cherries, plus the message: Call me OLD FASHIONED, but birthdays are better with bourbon. Perfect for cocktail lovers.

$4.95

Call Me Old Fashioned Cocktail Greeting Card

The You’re Hard to Shop For Greeting Card by Onderkast Studio features colorful orange, pink, black, and blue text on a white background—perfect for thoughtful gift-giving.

$4.95

You're Hard to Shop For Greeting Card

The Hot Diggity Dog Greeting Card by Onderkast Studio shows a cartoon dachshund in a hot dog bun with balloons and a party hat. Premium quality, vibrant HAPPY BIRTHDAY! text—ideal for fun birthday celebrations.

$4.95

Hot Diggity Dog Greeting Card

The Long Story Short Dog Birthday Greeting Card by Onderkast Studio features a long brown dachshund in a party hat across two panels with cakes, cupcakes, balloons, and presents. Front reads: Long story short, Happy Birthday!—perfect for dog lovers.

$4.95

Long Story Short Dog Birthday Greeting Card

Happy Happy Birthday! Cupcake Stand Greeting Card

$4.95

Happy Happy Birthday! Cupcake Stand Greeting Card

The Happy Birthday Dalmatian Greeting Card by Onderkast Studio features a Dalmatian in a party hat holding a Happy Birthday! balloon, with confetti on a white background. Printed in the USA.

$4.95

Happy Birthday Dalmatian Greeting Card

The Nothing But Smiles Greeting Card by Onderkast Studio features the message Hoping your birthday brings you nothing but smiles with yellow smiley faces and blue flowers on a beige background—a cheerful card for any celebration.

$4.95

Nothing But Smiles Greeting Card

Holy Crap It’s Your Birthday Cat Greeting Card

$4.95

Holy Crap It’s Your Birthday Cat Greeting Card

The Funfetti-filled Birthday Greeting Card by Onderkast Studio features a three-layer funfetti cake with candle, whipped cream, and blue candies, plus Have a Funfetti-Filled Birthday! on a yellow confetti-style background.

$4.95

Funfetti-filled Birthday Greeting Card

The Hip Hip Replacement Greeting Card by Onderkast Studio features a cake with candles and sparklers, plus the message When your age exceeds the warranty period, HIP! HIP! Replacement!—a playful pick for aging humor.

$4.95

Hip Hip Replacement Greeting Card

The Older Not Wiser Birthday Greeting Card by Onderkast Studio features bold OLDER? YEAH. WISER? EH. text on mustard yellow, soft pink, and light blue sections—perfect for anyone whos older but not wiser!.

$4.95

Older Not Wiser Birthday Greeting Card

Onderkast Studio’s Go Wild Party Animal Frosted Cookies Greeting Card features playful giraffes, elephants, and hippos with polka dots and party hats. Perfect for birthdays, it reads: Go wild, party animal!.

$4.95

Go Wild Party Animal Frosted Cookies Greeting Card

Have a Bloody Good Birthday! Bloody Mary Greeting Card

$4.95

Have a Bloody Good Birthday! Bloody Mary Greeting Card

Happy (Hour) Birthday! Cocktail Greeting Card

$4.95

Happy (Hour) Birthday! Cocktail Greeting Card *

Illustration of a blonde woman with red lipstick and sunglasses in a white tank top with 1989, surrounded by stars and “Party Like Its” text on blue. Wavy Die Cut TS 1989 Notecard by Onderkast Studio for stylish Swiftie vibes.

The Onderkast Studio Wavy Die Cut TS 1989 Notecard features a wavy blue scalloped edge, blank center, and black and gold decorative dots, shown placed atop a white napkin for a premium look.

$4.95

Wavy Die Cut TS 1989 Wavy Die Cut Notecard

The Woo! Birthday Dogs Greeting Card by Onderkast Studio features cheerful illustrated dog faces, colorful doodles, and playful “WOOOOOOOOO! WOO WOO WOO!” text on a white background with flowers and stars—perfect for dog lovers.

$4.95

Woo! Birthday Dogs Greeting Card

Lost Count Birthday Candles Greeting Card

$4.95

Lost Count Birthday Candles Greeting Card *

The Soak It In Bubble Bath Greeting Card by Onderkast Studio features a relaxing bath scene with a person in a tub, plants, basket, slippers, and bubbles. Perfect for celebrating self-care. Text on card: Today is all about you. Soak it in!.

$4.95

Soak It In Bubble Bath Greeting Card

Well Wishes for Your Birthday Bar Shelves Greeting Card

$4.95

Well Wishes for Your Birthday Bar Shelves Greeting Card

$4.95

Happy Birthday! Llama Greeting Card

Happy Birthday Party Balloons Greeting Card

$4.95

Happy Birthday Party Balloons Greeting Card

Hey There, Party Animal! Balloon Animals Greeting Card

$4.95

Hey There, Party Animal! Balloon Animals Greeting Card *

Fabulous Flamingo Floatie Greeting Card by Onderkast Studio: A light premium card printed in the USA, featuring a woman on a pink flamingo float. Front text: Hoping your day is as fabulous as you, which is like, ridiculously fabulous.

$4.95

Fabulous Flamingo Floatie Greeting Card

Buy now

Have a Super Sweet Birthday! Cupcakes Greeting Card

$4.95

Have a Super Sweet Birthday! Cupcakes Greeting Card

The Happy Birthday Headband - Fair card by Onderkast Studio features an illustrated woman with brown hair, sunglasses, pink earrings, red lipstick, a green top, and arched colorful letters spelling Happy Birthday.

$4.95

Happy Birthday Headband - Fair

Happy Birthday Ice Cream Cake Greeting Card

$4.95

Happy Birthday Ice Cream Cake Greeting Card

The Sweet Birthday Wishes Retro Cake Greeting Card by Onderkast Studio features a pink cake with cherries, rainbow details, and “Sweet Birthday Wishes” text. Comes with a white envelope.

$4.95

Sweet Birthday Wishes Retro Cake Greeting Card

Happy Birthday Rainbow Cake Greeting Card

$4.95

Happy Birthday Rainbow Cake Greeting Card *

The Big Birthday Energy Banner Greeting Card by Onderkast Studio features colorful letters spelling BIG BIRTHDAY ENERGY across three lines, playful confetti shapes in blue, yellow, pink, and orange, and comes with a white envelope.

$4.95

Big Birthday Energy Banner Greeting Card

The Happy Birthday to the Happy Camper Greeting Card by Onderkast Studio features camping-themed illustrations—perfect for gifting outdoorsy birthday card lovers.

$4.95

Happy Birthday to the Happy Camper Greeting Card

$2.95 ~~$4.95~~

Happy Freakin' Cake Day Greeting Card – FINAL STOCK

-40%

The Birthday Recipe Greeting Card by Onderkast Studio features playful kitchen illustrations and whimsical ingredients like joy and happiness. Printed in the USA, it’s a charming way to celebrate another great year!.

$4.95

Birthday Recipe Greeting Card

The Onderkast Studio Time to Throw Out the Fake ID! Greeting Card in Light features a trash can with a fake ID and crumpled paper—perfect for celebrating a 21st birthday.

$2.95 ~~$4.95~~

Time to Throw Out the Fake ID! Greeting Card

Buy now

-40%

The Happy Birthday Sweet Cheeks Greeting Card by Onderkast Studio features an illustration of three women in swimsuits and party hats with HAPPY BIRTHDAY, SWEET CHEEKS! on a confetti background—fun and premium for any birthday.

$4.95

Happy Birthday Sweet Cheeks Greeting Card

The Witching You a Wicked Birthday Greeting Card by Onderkast Studio features mystical illustrations—crystal ball, potions, stars, skull, and snake—and the front message “Witching You a Wicked Birthday.” Perfect for lovers of magical vibes.

$4.95

Witching You a Wicked Birthday Greeting Card

The Happy Birthday to You Beautiful Wildflower Greeting Card by Onderkast Studio features simple, colorful illustrations of four flowers and cursive happy birthday to you, beautiful wildflower, paired with a white envelope.

$4.95

Happy Birthday to You Beautiful Wildflower Greeting Card

The Have a Bangin’ Birthday! Greeting Card by Onderkast Studio features a cartoon revolver with a patterned handle shooting a BANGIN flag, plus the message Have a BANGIN BIRTHDAY! on a pink background.

$4.95

Have a Bangin’ Birthday! Greeting Card

Dear Birthdays, Be Kind, Rewind Greeting Card

$4.95

Dear Birthdays, Be Kind, Rewind Greeting Card

$4.95

Happy 29th Birthday Again Greeting Card

To the Coolest Cat Lady I Know! Cleopatra Greeting Card

$4.95

To the Coolest Cat Lady I Know! Cleopatra Greeting Card

$4.95

Have a Fab Birthday Greeting Card

The Happy Birthday Song Greeting Card by Onderkast Studio features cakes, candles, banners, stars, and confetti with colorful “HAPPY BIRTHDAY TO YOU!” lettering inspired by the song—perfect for a festive celebration.

$4.95

Happy Birthday Song Greeting Card

Party Like You’re Going Extinct Dinosaurs Greeting Card

$4.95

Party Like You’re Going Extinct Dinosaurs Greeting Card

$4.95

Hoppy Beerthday! Beer Greeting Card

$4.95

Happy B-Day! Sunglasses Greeting Card *

Have a Super Nar-ly Birthday! Narwhal Greeting Card

$2.95 ~~$4.95~~

Have a Super Nar-ly Birthday! Narwhal Greeting Card – FINAL STOCK

-40%

$4.95

Bon Anniversaire Macarons Greeting Card *

The Your Thirties Greeting Card by Onderkast Studio features pastel text saying “Your thirties are so much better than your twenties – Liars,” with a scalloped white border on a light teal background.

$4.95

Your Thirties Greeting Card

Celebrate with humor using the Onderkast Studio Holy Shit You’re Old! Greeting Card—featuring bold text, a toilet paper roll with candles, an empty roll, and a cupcake with a playful swirl design.

$4.95

Holy Shit You’re Old! Greeting Card

$4.95

Happy Birthday Cigar Greeting Card *

The Happy Birthday! Banana Suit Girl Greeting Card by Onderkast Studio shows a smiling girl in a banana suit with arms raised, “HAPPY BIRTHDAY!” text, and comes with a partially visible light-colored envelope.

$4.95

Happy Birthday! Banana Suit Girl Greeting Card *

Buy now

The Another Year and Still Smashing It Pickleball Greeting Card by Onderkast Studio features a pink border, a hand with a green-and-white striped paddle hitting a yellow ball, and cheerful birthday wishes for pickleball fans.

$4.95

Another Year and Still Smashing It Pickleball Greeting Card

The Yay Wacky Waving Inflatable Tube Man Greeting Card by Onderkast Studio features a smiling orange tube man with arms raised, colorful swirls, and “YAY!” repeated—making it the perfect fun congrats card for any celebration.

$4.95

Yay Wacky Waving Inflatable Tube Man Greeting Card

Birthday Cards

Onderkast Studio

Shop

Order Pickup

Info