The "Cosmic Kittens" theme features a collection of playful and whimsical designs showcasing adorable doodle kittens in space. Each design incorporates a vibrant cosmic background filled with celestial elements like shooting stars, planets, and galaxies. The doodle-like strokes and bright color palette enhance the whimsical and dreamy feel of the designs. The kittens are depicted in various scenarios, including floating through space, zooming in rocket ships, and boldly exploring cosmic territories, making for an enchanting and adorable theme.