My son had a last minute change of heart for his cupcakes. He decided to have Mario Mushroom cupcakes instead of using the Mario Kart Wii Cupcake Toppers. His favorite Mario Mushrooms are the Mega Mushroom (yellow with red dots) and the Mini Mushrooms (blue with white dots).
So, I used a normal muffin tin for the Mega Mushrooms, yellow icing and red M&M's. For the Mini Mushrooms, I used a mini muffin tin, white icing and blue M&M's. (I know I have the colors reversed with the Mini Mushrooms but, it was easier and my son didn't mind.)
I used white muffin cups for all the muffins. And I drew the eyes on the outside of the muffin cups with a non-toxic magic marker. Then, I lined a cookie sheet with foil and arranged the Mega Mushroom cupcakes in the middle and made a border with the Mini Mushroom cupcakes. I topped it off with a number candle. My son and all his friends loved it!