You could always do a baseball cake. I mean, decorate the cake like a baseball diamond/field. I did one years ago when I was a kid for a cake contest. It got me the blue ribbon. I can't remember all the details of how I decorated it, but I do remember I used candy. Lots of candy.
I did see some great cake decorating ideas yesterday (maybe the day before) on the foodnetwork channel. It was Sandra Lee (semi-homemade cooking). She had some of the cutest and easiest ideas I have seen in a long time.
Good luck.