In the bustling meadow of Central Park, Iron Man and Spider-Man have decided to take a day off from saving the world to celebrate a birthday in style. Picture a sunny day with cartoonish, fluffy clouds lazily drifting by. One cloud cheekily spells out "Happy Birthday, Arthur!" in a playful, whimsical font, reminiscent of the imaginative skies of Winsor McCay's "Little Nemo in Slumberland".

Iron Man, in his shiny red and gold armor, is sitting cross-legged on a checkered picnic blanket that has been spread out on the lush green grass. He holds a bright, helium-filled number "4" balloon that gleams with metallic reflections, perfectly matching his suit. The balloon is floating upwards, tethered to his wrist, adding a playful touch to the scene. Next to him, Spider-Man, in his classic red and blue costume, is playfully hanging upside down from a tree branch just above the blanket, as if he couldn't resist a little fun with his web-slinging abilities.

On the picnic blanket sits a delectable chocolate birthday cake, extravagantly decorated with icing that spells "Arthur" in cheerful, colorful letters. Four blazing candles proudly stand atop the cake, their flames flickering gently in the soft breeze. Around the cake, there are plates of finger sandwiches and a bowl of fruit salad, adding a homely, classic picnic feel. In the background, a couple of squirrels and a bird peek curiously from behind a nearby bush, drawn by the festive scene.

The overall layout of the card is akin to the playful and detailed worlds of Bill Watterson's "Calvin and Hobbes", combining a sense of action with an endearing tranquility. This birthday card cover captures not just a scene, but a vibrant story of friendship, heroics, and celebration, all coming together to wish Arthur the happiest of birthdays.

Generated with these themes: Iron man and spider man having a picnic with birthday cake with 4 candles. Iron man is holding a number 4 balloon.

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