We had a butterfly birthday party for my three year. The girls all go butterfly wings, and butterfly wands. Then we ate butterfly cake. I made it myself, from a round cake.. Not to be conceded but I was surprised at how well my butterfly turned out. Just so you know if you cut up a cake to form a new shape it is necessary, no vital to freeze your cake, do a frosting crumb coat, freeze again then frost a finished layer.
Even though she was all over a butterfly party, my daughter kept talking about hello kitty cupcakes. I could not find any cupcake toppers with hello kitty that were actually cute, so I made my own. They are a little large, I didn't realize that at the time. Problem is you make the cupcake toppers before the cake.