My son saw a cake like this on Flickr and asked if I could make it for his birthday. What good is it having a mom that makes cakes if you can't get the cake you want? So I turned in and this is the cake he ended up with. The bottom is made of two layers of chocolate cake and one layer of vanilla cake. The "bomb" on top is half chocolate cake and half vanilla cake. The cake is frosted in vanilla buttercream on the bottom tier and chocolate buttercream on the "bomb". Decorations are made of fondant. My cake is not nearly as good as the inspiration cake, plus I didn't make a Mario, but I'm pleased with how it turned out and my son loved it!