I am making a Aztec Pyramid and am most likely going to be stacking square cakes to get the shape, easy enough (I hope!) However, I am stumped on how I should do the middle "slide" or whatever it is called, lol. Any suggestions? Also, for the "stone" I was planning on coloring the fondant light gray and then sponging on darker gray to give it that mottled look. What do you guys think? Thanks for any help, I really apprecaite it!