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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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Seamless vector Valentine's Day template with a scattering of soft pink hearts in cartoon style
Flat Vector Illustration of Seamless Pattern with Abstract Flowers and Leaves. Vibrant Pink, Yellow, and Green Palette. Decorative Design for Backgrounds, Wrapping Paper, or Textile Prints
Colorful Easter Design with Hand-Lettering, Decorative Eggs, and Spring Flowers, Perfect for Celebrating Easter and Spring Festivities with Vibrant Colors and Festive Themes. EPS 10
Set of cheerful clowns and balloons in color and black-and-white versions
Fun Prankster T-Shirt Design - Prankster in Action Day 2025
illustration of a cheerful, vibrant-colored goat, perfect for a children's theme
A delightful seamless pattern featuring cheerful cartoon bananas on a vibrant blue backdrop, conveying a playful and lighthearted theme suitable for fun designs.
Colorful planets with happy faces, rings, stars, and moons on a bright pink background cartoon vector illustration for educational materials, or fun space-themed
Birthday Toast at the Office
Hand drawn simplistic illustration ice cream poster. Flat vector illustration. Perfect background for posters, cover art, flyer, banner.
A Cute and spooky western Halloween illustrations featuring smiling pumpkin, playful jack o lantern, and ghostly wagon
Fun Prankster T-Shirt Design - Prankster in Action Day 2025
Cheerful ghost character smiling while holding three pumpkin-themed balloons, celebrating the joyful spirit of Halloween festivities
uxurious spruce in a children's cartoon style"
Vibrant illustration of a jester hat with red, green, and blue panels and yellow pom-poms, perfect for festive themes.
illustration of a cheerful, vibrant-colored Squirrel, perfect for a children's theme
Bright characters in the form of repair tools, on a blue background, demonstrating funny poses and funny facial expressions.
ink heart with wings in a whimsical vector illustration, symbolizing love, affection, and romance. Ideal for Valentine's Day themes or romantic design elements.
Colorful turquoise balloons with flowing strings create a festive background pattern
A playful vector illustration featuring three cartoon ghosts in various poses, each with unique facial expressions, showcasing a whimsical and lighthearted Halloween theme.
Cute birthday card featuring a cheerful bird wearing a party hat. Includes HB to you text, stars, and space for writing. Fun and lighthearted theme. Vector illustration.
Vector illustration of a joyful fairy child with vibrant colors and expressive features, showcasing a playful and whimsical style
Illustration of red heart-shaped balloons floating with fluffy white clouds against a bright blue sky, conveying themes of love, romance, celebration, and happiness for whimsical, cheerful occasions
Cartoon Moon Character Playing Video Game with Controller – Cute and Whimsical Nighttime Illustration
A fun and quirky cartoon illustration of a pizza slice lounging back with sunglasses, embodying a cool and relaxed vibe. Perfect for themes related to food, leisure, and lighthearted enjoyment.
Seamless Cute Sleeping Cats and Moons Pattern for Cozy Pajamas, Pet-Themed Prints, or Relaxing Nighttime Designs
A playful vector pattern featuring brown horses and red hearts on a white background, ideal for children's designs or romantic themes.
A Cute cartoon bus with smiling face, rain clouds, and raindrops, perfect for rainy day theme
Seamless Pattern Featuring Pink Dragons, Castles, Crowns, Birds, and Hearts. Playful Design for Kids and Fairytale Themes. Decorative Composition on Light Background. Flat Vector Illustration
Set of cute onions in kawaii style on a white background, perfect for fun illustrations, children's products, and playful designs.
Monster Helpers set. Each character embodies a unique work-related concept, bringing a lighthearted touch to professional themes. Vector illustration
A simple yet eye-catching illustration featuring stickman characters with yellow heads, accompanied by the text "Where are U?" in vibrant colors. This image represents a sense of searching or calling
Abstract composition with lively pink and blue doodles, fun forms and artistic freehand strokes in a modern creative style.
Cheerful balloons shaped like clowns and stars in a cartoon style. Festive balloons and clowns with hats in a children's cartoon vector illustration
Hand-drawn collection of vector spot art doodles with Christmas theme. Line drawing on one layer, color fills on another and shadow on bottom layer: easy to separate and recolor.
Funny skeleton waves cheerfully against a black background, perfect for Halloween decorations and themes
Monster Helpers set. Each character embodies a unique work-related concept, bringing a lighthearted touch to professional themes. Vector illustration
Seamless pattern with hand-drawn green trees on a white background, ideal for nature-themed designs and wallpapers.
Delicate transparent balloons floating upwards, perfect for party themes, celebration designs, or whimsical event visuals. Ideal for invitations, decorations, or lighthearted branding.
illustration of a cute, vibrant-colored Flamingo, perfect for a children's theme
illustration of a cheerful, vibrant-colored dog, perfect for a children or kid theme
illustration of chalkboard perfect for a kid school or education theme
Cheerful children's design of a girl standing under an umbrella, perfect for playful illustrations, greeting cards, and seasonal designs.
Embrace humor with this witty MS-themed t-shirt. Featuring a playful design, it highlights the overactive immune system with a touch of comedy. Perfect for awareness and support.
Cute Watermelon Cartoon Character Graphics
Loving Cartoon Valentine. Playful cartoon figure holding a heart on a pastel purple background with a sweet message. Perfect for Valentine’s Day cards, posters, and heartfelt designs.
illustration of a cheerful, vibrant-colored cat, perfect for a children's theme
illustration of crayons, perfect for a kid school or education theme
illustration of a cheerful, vibrant-colored sheep, perfect for a children's theme
illustration of a cheerful, vibrant-colored mouse, perfect for a children's theme
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Illustration of a man with magnifying glass

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