I just read this thread as I was making my son's Power of Portal Skylanders cake. The crumpled brown bag approach worked great!!! I used homemade fondant and I think it turned out pretty good. It's difficult to see in the picture, but the texture was perfect. Then I added depth by using black food coloring deluted with water to paint the cracks of the stone. I am an amature and this cake isn't perfect, but my son is thrilled!
