I made this cake for my uncle's 80th birthday and modeled it after a John Deere model 80 tractor. The tractor is made of a cake I made in a loaf pan, the large tires are glazed donuts, and the front tires are cake donuts frosted black. The trailer is a cake board, and the hay bales are small loaves frosted green then pricked with a toothpick to give them texture.