I made this cake for my cousin's birthday pool party. To make the pool I scooped out the buttercream in the middle and filled it with dyed piping gel. The sandy stuff around it is sprinkles. The raft and ropes on the side are peel apart twizzlers, the chain that separates the shallow and deep ends is tic-tacs, the beach ball is a mint colored with food coloring markers, and the rest is pretty obvious. The kids (20 or so teenagers) LOVED it.