I made this Pool Party Theme Idea a compilation of other images I saw. It was a 14″ round pan. I used three cakes mixes for the cake. When cooled I hollowed out the middle, put white icing on the entire cake.

Then I applied the candy for the tiles. I then poured in the blue jello. You mix up the jello and let it sit for 1.5 hrs. Then the next morning, I added the bears and diving board, and all final touches. My daughter loved it and so did her friends. They even asked for seconds!