Baked a vanilla sponge cake yesterday, and found this great recipe on cooks.com for vanilla frosting. Uber easy and goes great with anything! I only added 1 1/2 to 2 cups of sugar, however, because I don't like super-sweet frosting.
EASY VANILLA FROSTING:
*1/3 cup soft butter
*3 cups confectioner's sugar (I used about 2)
*1 1/2 teaspoon vanilla
*2 tablespoons milk
Mix the butter and sugar together, then stir in the milk and vanilla extract. Enjoy!