This cake is a 12x18 sheet cake and is frosted with BC frosting and then covered with MMF. I didn't know anything about the wiggles when my boss asked me to make this for his son's 3rd birthday. He had to bring me one of his toys for me to go by. I also looked up other Wiggles cakes that were submitted for ideas. I am a scrapbooker so I used some of my letter templates for the letters. : )