I had an opportunity to make an aloha shirt cake for a surprise 50th birthday luau. The cake was a shaped 1/2 sheet cake with fondant. The wife wanted a tropical theme, but also to make it personal. The palm trees gave it a tropical look and the spades with "lucky 13" was a inside joke for the birthday boy. I loved that the cake didn't scream birthday. The only way you could tell was the name and age on the shirt's tag. The crushed graham crackers and chocolate sea shells made it a perfect centerpiece for his Luau.