When I was about 11 or 12, myself and 2 friends made a wildly derivative Top Trumps/Pokemon card game called (for some reason) Rakafikimon using Microsoft Paint.
I found the cards the other day and have decided, as an illustration exercise, to work up each character into a fully illustrated design and maybe make myself a whole new pack of Rakafikimon. I'm trying to do each character in under 2 hours.
I'll post more as I complete them.