I went to a wedding a couple of years ago that had cupcakes for the wedding cake. It was an outside wedding, and the cupcakes were gorgeous (Chocolate with cream colored icing... yum). As an added touch, they had the recipes for the cupcakes and the frosting in thier wedding programs.

Cupcakes are very versitile, you can make them whimsical and fun, or they can be elegant, or somewhere in between. I say go for it, everybody loves a good cupcake!