Math Themed Cake?

Hi all! I'm an elementary school math teacher and was thinking of baking a cake for my students as a year end party! Do you guys have any suggestions for a math-themed cake?

Over the year I've taught math related to mostly geometry (angles, area, distance, volume, surface area, quadrilaterals, vectors, etc). I've been thinking of having the top view of the cake look something like this (scroll down to the image). However, I think it is somewhat bland/boring and would like to go more ambitious with the overall shape of the cake. Please let me know in the comments down below for your thoughts. You help is greatly appreciated!

Cheers,

Angela