I think it would be cute to make it look like a used car lot with a little sales "shack" and flag banners hanging from the shack to telephone poles or something. A dirt lot with grass around the edges, maybe even a couple of potholes in the lot with a few cars around. You could put a sign on the door to the shack that says "Closed for ?'s Birthday".
Yes Go with CakeGirls Idea!! haha..but make a Small FOR SALE Sign on the cruiser =0) it will be GREAT! hahaha.. I just love the Idea. its what I was thinking of too.
have lots of fun with it!
With it sitting out all day I would make sure I didnt use an icing recipe with butter. =0)