Create a serene birthday themed illustration set in the prehistoric era. Use a subdued palette of grey and green to create a tranquil and somewhat solemn backdrop. In this setting, depict a contemplative Stegosaurus adorned with a subtle festive crown striding through a crowd of calm dinosaurs and forest animals. Include hints of party elements like a fossil-like cake and muted balloons, allowing them to blend seamlessly into the prehistoric environment, insinuating a low-key celebration from a time long past.

Generated with these themes: Dinosaur, animals .

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