The front cover of the birthday card showcases a vibrant, whimsical scene that blends together all the requested themes in a charming, cartoonish style inspired by the listed artists.

In the center of the scene, we have a giant birthday cake with 22 candles, each designed like a tiny stage spotlight, flickering as though ready for a grand performance. The cake is decorated with frosting patterns that mimic musical notes and theatrical masks, while the top layer features a miniature DeLorean car from "Back to the Future," poised as if ready to take off.

Around the cake, a troupe of bunnies, dressed in Broadway-style costumes, perform a musical theatre number. One bunny, dressed like a little Phantom of the Opera, dramatically sings atop a carrot-shaped microphone stand. Another bunny, in a top hat and cane reminiscent of a classic tap dancer, taps away next to the cake.

To the right of the cake, there's a whimsical time-travel element: a retro-futuristic time machine control panel, styled after Doc Brown’s invention, with colorful, oversized buttons and dials that the bunnies can interact with. One bunny, wearing a lab coat and goggles, hops on the control panel, seemingly adjusting the time settings.

In the background, a theatre stage curtain with the words "Happy 22nd Birthday!" opens wide, revealing a fantastical blend of 1950s diner and 1980s neon lights, connecting the nostalgic feel of "Back to the Future." Above the curtain, spotlights and marquees illuminate the scene, casting a warm, inviting glow.

Every element is drawn with a playful and detailed touch: the bunnies' expressive faces and intricate costumes, the frosting’s swirls on the cake, and the detailed retro-futuristic gadgets. The overall layout bursts with energy, each part telling its part of the interconnected story.

The style incorporates Schulz’s expressive characters, Disney’s whimsical details, Tezuka’s dynamic scenes, Watterson’s lively interactions, and hints of Larson’s surreal humor, creating a rich, layered scene perfect for a quirky, unique birthday greeting card.

Generated with these themes: Musical theatre, 22, Cake, Back to the future , and Bunnies.

Made with ❤️ by AI.