Create a vibrant birthday illustration set amidst an apocalyptic setting. The sky is filled with rainbow colors, contrasting the scene below. Illustrated should be zombies in festive gear mingling with prancing unicorns adorned with ribbons. Amidst the ruins, depict cats having fierce expressions engaged in pretend fights, carrying tiny war flags. Capture the atmosphere of joyous defiance, using the apocalypse as an enchanting backdrop for a party that seems to defy the end of times. The image's colors should demonstrate the blending of rainbow streaks into the chaos.

Generated with these themes: Zombies, Unicorns, Rainbows, Cats, Apocalypse , and War.

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