55 lighthearted theme designs graphics for t-shirt and print on demand merch

Download lighthearted theme t-shirt designs and other merch graphics like book covers, phone cases, tote bags and more.

Sort by

Most relevant
illustration of a cheerful, vibrant-colored bear, perfect for a children's theme
illustration of a cute, vibrant-colored capybara, perfect for a children's theme
illustration of a cheerful, vibrant-colored deer, perfect for a children's theme
illustration of a cheerful, vibrant-colored Squirrel, perfect for a children's theme
Green balloons with bunny ears in a repeating pattern for festive decoration
illustration of a cheerful, vibrant-colored zebra, perfect for a children's theme
illustration of a cheerful, vibrant-colored Giraffe, perfect for a children's theme
illustration of a cheerful, vibrant-colored Hedgehog, perfect for a children's theme
Colorful birthday party decorations with cake, balloons, and party hats in festive design
strawberry characters, ideal for children's books, illustrations, stickers, and playful designs. Perfect for adding fun to various projects.
illustration of a cheerful, vibrant-colored mouse, perfect for a children's theme
illustration of a cheerful, vibrant-colored pony, perfect for a children's theme
illustration of a cheerful, vibrant-colored cat, perfect for a children's theme
illustration of a cheerful, vibrant-colored duck, perfect for a children's theme
illustration of a cheerful, vibrant-colored goat, perfect for a children's theme
Hand drawn vector pattern of colorful balloons floating on a white background for festive designs vector illustration
Flat style illustration of a charming blue mailbox filled with red roses and a love letter, perfect for Valentine's Day designs, romantic messages, or sweet themed projects.
Chicken coloring page. The bold and clear line art makes it easy to color with color reference, a4 paper size printable, very suitable for children's coloring activities
A cute heart trapped in a spider web, conveying a playful theme.
Colorful celebration icons including masks, gifts, and balloons.
Flat-style illustration of a red mailbox filled with love letters and a note saying With love, perfect for Valentine's Day designs, romantic greetings, or cute themed projects.
Red balloons with strings arranged in a fun pattern on a white background
Colorful turquoise balloons with flowing strings create a festive background pattern
Happy easter card with colorful eggs and bunny design.
Colorful balloons in a playful pattern perfect for festive celebrations and decorations
Fun And Sparkly "Warning: Easily Distracted by Shiny Things" T-Shirt
Ice Cream Cartoon T-shirt Design with Fun, Colorful, and Playful Graphics
Playful And Trendy "I’m a Snack, Not a Meal" T-Shirt
Funny white llama peeking from the corner with glasses, a red clown nose, and a mustache on a blue background.
Cute jester clown in a cupcake costume with a speech bubble on a light orange background, playful and perfect for April Fools.
Smiling orange clown cupcake with curly hair, red clown nose, and a party hat, perfect for April Fools celebrations.
Hand drawn colorful balloons and festive garlands background create a cheerful atmosphere for celebrations vector illustration
Smiling clown in a cupcake costume with a speech bubble on a black background, creating a humorous and festive design.
Cute Valentine Scene. Sweet cartoon figure hugging a cat on a pastel purple background with hand-drawn love elements. Ideal for Valentine’s Day cards, posters, and heartfelt designs.
Playful April 1 text on white background
Colorful hand drawn seamless sun pattern on a white background for kids cute cheerful design vector illustration
Certified April Fools' Day T-Shirt Design - "Laugh Out Loud Guaranteed!"
Fun Prankster T-Shirt Design - Prankster in Action Day 2025
Black and white party hat design with stars for celebrations and festive occasions
Minimalist design of clown glasses, a red nose, and a mustache on a bright blue background, symbolizing April Fools humor.
A drawing of a pair of kidneys with black and white lines. The drawing is in a cartoon style and has a playful, lighthearted mood
Fun Prankster T-Shirt Design - Prankster in Action Day 2025
Stylish Coffee T-Shirt: First, I Drink Coffee. Then, I Do the Things
Funny T-Shirt Design: I Put the Pro in Procrastinate with Humor Icons
Three clown cupcakes on white background
Vector illustration of a wine glass in a simple doodle style. Clean and minimal design suitable for commercial use, including menus, labels, branding, or wine-themed projects.
A drawing of a pair of kidneys with red, blue and yellow lines. The drawing is in a cartoon style and has a playful, lighthearted mood
A playful collage of pastel-colored hearts in various sizes with a 3D paper-cut style, arranged against a clean white background, exuding charm and lightheartedness.
A drawing of a pair of kidneys with black and white lines. The drawing is in a cartoon style and has a playful, lighthearted mood
Seamless Pattern With Dog and Cat Vector, in the Style of Light Black and Red, Linear Patterns and Shapes, Humor Meets Heart, Animated Gifs, Catcore, Stenciled Iconography, Shaped Canvas
Sponsored results by Shutterstock Logo
Get 15% off with code: VEXELS15
Illustration of a man with magnifying glass

Sorry, we couldn't find any matches for "lighthearted theme" .

Find the Best Designs for You

Hottest Designs New Merch Designs Browse by Categories

Find the best designs for you

of 2