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56 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.

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illustration of a cheerful, vibrant-colored fox, perfect for a children's theme
illustration of a cheerful, vibrant-colored Lobster, perfect for a children's theme
illustration of a cheerful, vibrant-colored mouse, perfect for a children's theme
illustration of a cheerful, vibrant-colored Squirrel, perfect for a children's theme
Colorful decorative bunting creates a festive atmosphere for celebrations and events
illustration of a cheerful, vibrant-colored elephant, perfect for a children's theme
illustration of a cheerful, vibrant-colored rabbit, perfect for a children's theme
illustration of a cheerful, vibrant-colored fish, perfect for a children's theme
illustration of a cheerful, vibrant-colored zebra, perfect for a children's theme
illustration of a cheerful, vibrant-colored bear, perfect for a children's theme
illustration of a cheerful, vibrant-colored Hedgehog, 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
Cute seamless pattern design featuring playful hand drawn fish for kids design vector illustration
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.
Green balloons with bunny ears in a repeating pattern for festive decoration
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.
Hand drawn vector pattern of colorful balloons floating on a white background for festive designs vector illustration
A cute heart trapped in a spider web, conveying a playful theme.
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.
A seamless vector pattern featuring brown horses and sheriff stars on a white background. The horses are depicted in a playful, cartoonish style, adding a whimsical touch to the design.
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 drawing of a pair of kidneys with black and white lines. The drawing is in a cartoon style and has a playful, lighthearted mood
Colorful celebration icons including masks, gifts, and balloons.
Red balloons with strings arranged in a fun pattern on a white background
Colorful turquoise balloons with flowing strings create a festive background pattern
Funny love-themed doodle stickers with hearts, gifts and sweet treats for Valentine's Day
Happy easter card with colorful eggs and bunny design.
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
Fun And Sparkly "Warning: Easily Distracted by Shiny Things" T-Shirt
Playful And Trendy "I’m a Snack, Not a Meal" T-Shirt
Colorful balloons in a playful pattern perfect for festive celebrations and decorations
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
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.
Ice Cream Cartoon T-shirt Design with Fun, Colorful, and Playful Graphics
Smiling orange clown cupcake with curly hair, red clown nose, and a party hat, perfect for April Fools celebrations.
Cute jester clown in a cupcake costume with a speech bubble on a light orange background, playful and perfect for April Fools.
Playful April 1 text on white background
Funny white llama peeking from the corner with glasses, a red clown nose, and a mustache on a blue background.
Hand drawn colorful balloons and festive garlands background create a cheerful atmosphere for celebrations vector illustration
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
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.
Fun Prankster T-Shirt Design - Prankster in Action Day 2025
Smiling clown in a cupcake costume with a speech bubble on a black background, creating a humorous and festive design.
Black and white party hat design with stars for celebrations and festive occasions
Colorful hand drawn seamless sun pattern on a white background for kids cute cheerful design vector illustration
A whimsical illustration of cartoon Sausages with smiling faces, displaying a playful and cheerful vibe against a dark backdrop. Perfect for fun, fantasy, and imaginative themes in various application
Certified April Fools' Day T-Shirt Design - "Laugh Out Loud Guaranteed!"
Fun Prankster T-Shirt Design - Prankster in Action Day 2025
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Illustration of a man with magnifying glass

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