Picture a vibrant birthday scene with Rick and Morty front and center in a cartoon style reminiscent of Bill Watterson's expressive lines and playful layout from "Calvin and Hobbes." Rick, with his signature spiky blue hair and lab coat, stands slightly hunched, holding a bubbling test tube in one hand, from which multicolored confetti erupts into the sky. Morty, looking slightly bewildered with his round eyes and simple yellow T-shirt, holds a large, exaggerated cake that seems to defy gravity with its towering layers, each colored in a vivid hue like the bright primary palette of classic Disney animations.

In the background, a scene inspired by Hergé's clear line style features a surreal landscape with rolling hills of blue and green checkerboard patterns, dotted with cartoonish alien flora, like oversized daisies with polka-dot petals. A gigantic, round spaceship hovers above, adorned with colorful birthday lights reminiscent of Osamu Tezuka's retro-futuristic designs.

Above them, suspended by miniature alien creatures with wings, is a banner fluttering across the scene with the word "Jenny" emblazoned in bold, playful letters that resemble the playful typography often seen in Gary Larson’s "The Far Side" comics. The banner is a vibrant blend of pink and orange, drawing the eye with its undulating movement.

The sky, inspired by the dream-like expansiveness of Winsor McCay’s "Little Nemo in Slumberland," is a gradient from bright blue to deep purple, speckled with star-like twinkles and floating cupcakes, as if gravity took a break for this birthday celebration. On one of the hills, a tiny cartoon Morty waves a flag that reads "Happy Birthday!" in an exaggerated comic sans-esque font, adding to the scene's whimsy and exaggeration.

Generated with these themes: Rick and morty saying happy birthday in a funny way.

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