I made this cake for my psychology class...I told my teacher I would bring a cake for the last day of class, but I don't think she expected this! I used MMF to cover and a veining tool to make the "gray matter" pattern. I brushed on a little bit of black food coloring in the grooves and then brushed the whole cake with piping gel to finish it off! A lot of fun to (try to figure out how to) make!