What are your ideas on the best way to display 400 cupcakes? Have never done cupcake order before. It will be for a senior prom and they want them frosted in several different colors.

What is the prom theme? You could incorporate that. Or if you want to keep it simple you could do large cupcake stands/tiers decorated in their colors or style.

It's a Candyland theme. Thought about putting a gumdrop on each cupcake, but just not sure how to display that many cupcakes.

Ooh, candyland! I would do several tiered cupcake stands - square instead of round, and edge them with a tile/square design in colors that match the board game! I would use gumdrops and any other candy you can find that is in the game to use - that would be great!