I made this cake for my brothers 22nd birthday. The baseball and football are made out of rice crispy treats and fondant. The whole cake is buttercream. Everyone thought the white part was marshmallows, but nope. I used tip 12 and white buttercream. I wish i could make cakes like this in fondant but my family HATES fondant. I got the idea for this cake from the Wilton Yearbook 2007. It was a really fun spongebob cake.