A very creative friend of mine recently had a birthday party for her six-year old daughter. Instead of making a cake she made cupcakes without frosting. She then gave the girls the chance to decorate their own cupcakes.
As a six-year old I can only imagine how much fun this was. I have actually been thinking about doing this for my 27th (wow, I'm getting close to 30) birthday in November. I don't think my friends will have nearly as much fun as I will, although I bet our cupcakes will look similar to the six-year olds.