I am thinking of covering my sheet cake with modeling chocolate but I was.wondering if I can't paint it like I would fondant? I am making a cake for a chef and I my goal is to make the actual cake look like a wooden cutting board....any suggestions? red velvet cake with white chocolate cream cheese frosting a lot of people don't like the taste of fondant so I don't really want to cover the entire cake with it.

I have never done it, but I have seen it done on Challenges before. I believe they use cocoa butter to paint with. Good Luck!

http://www.chocoley.com/cocoa-butter-colors.htm

HTH