I usually buy Devil's Food cake. I use 2-8" cake pans and follow the instructions on the box. You can also make a homemade cake. To cut the cake, just follow the instructions below. I also use any kind of white frosting to frost the cake. For the ears, I use coconut and mix it with red food coloring. For the eyes, nose and also around the bow-tie I use jelly beans. And licorice for the whiskers and mouth.
My favorite is using green food coloring and coconut around the entire cake for green grass and then sprinkling jelly beans on top of it. However, I try and keep the whole center of the cake coconut free since there are coconut haters out there. For this cake I just sprinkled a bag of jelly beans and some milk chocolate eggs around the entire cake.
