Don't hate mii! A virtual dice application that acts like 6 sided dice or a random number generator. A application that counts in the fibonacci sequence (0,1,1,2,3,5,8,13,21,34,55…) or (1,1,2,3,5,8,13,21,34,55…) Maybe take a look at the YouTube channel Numberphile for inspiration? (A channel that talks about numbers & maths in interesting way.) I could come up with more ideas if you want?