If you are having a pizza party, make the cake a pizza also!!  I took a plain white cake mix, and made two round layer cakes.  I then took white frosting and tinted it with red food coloring until the color of tomato sauce. Frost just the top of each cake layer. Sprinkle grated white chocolate or coconut over the frosting to resemble the cheese. Then take red fruit by the foot, and cut out around 20 rounds to resemble pepperonni slices. Arrange over the chocolate/coconut.  For extra fun, go to your local pizza parlor and ask for two small pizza boxes, and put the pizza cakes in the pizza boxes!!