For my son's birthday we took them to the local Home Depot for the kid's workshop! So, to celebrate the wood building theme I made the cake to look like two pieces of wood. I even made chocolate/yellow swirl cake for an added touch! I mixed light brown and dark brown fosting slightly to get an uneven look and then scraped each with a texture tool I have. Then I added dark frosting to make "knots" and a couple of swipes to add more grain look. He was happy with it!