Secret to flat cakes: wet cake strips (i., Bake Even Strips) and wrap around the cake pans. They act as an insulator to help the cake bake evenly (flat). You can also use strips of towel: drench, wrap around the pans, and bake.
Checkerboard Birthday Cake - Eat Healthy Stockphoto My mom had a set of cake pans with separators that made a checkerboard cake. The batter had to be extra thick to keep it from running, but it turned out pretty. This way, however, is foolproof.
Oreos and Kit Kat Cake Great idea, use your favorite cake with chocolate icing, then decorate with oreo's, kit kats, and chocolate balls (possibly my favorite Lintd chocolates. Such a cute idea and such an impressive presentation.