My brother requested a tank cake for his birthday, and this one is super easy to make! To start out, I used 2 boxes of cake mix. One of them was Duncan Hines butter golden, and the other was Dark chocolate fudge. I mixed up the boxes in separate bowls, and I dyed the butter golden cake green, and I added black food coloring to the chocolate to make it black. Then I poured my cake batter into a 13x9 inch cake pan, and a 8x8 inch cake pan. I alternated chocolate, yellow, chocolate, yellow, etc.. then marbled it together to make a sort of camouflage pattern. I baked the cakes in the other according to the back of the cake box, but I had to add a little more time, so I think I ended up cooking them for about 45 minutes. Once they were cooled and out of their pans, I prepared my cake board using a cookie sheet lined with tin foil. I would of used a normal cake board, but I didn't have any. Meanwhile, I took my icing, and dyed it green. To get the shade I wanted, ...