I decorated a foam cake once. Is that what you are talking about? Could cut Styrofoam into wedges & decorate with Royal icing so it would keep. Could get the "cake" area looking like cake by using fine sponge to make it look like cut cake. Jan

Thanks, but that is not exactly the idea. I remember using paint to make the icing. It looked just like dripping chocolate. But I can't remember what I used for the "cake" part. It looked exactly like a piece of cake.

yeah, I was about to say styrofoam would work great.