At lastAt last I have time and I am mentally capable (opposite to yesterday -- long story...) of coding. So, Idea. I will try to go 3d. It is probably going to be big failure, but who cares (I care, actually).
The idea is inspired by wonderful game Proun (http://www.proun-game.com/) + child toy named shape sorting (http://www.google.lt/search?tbm=isch&q=Shape%20Sorting) + Stupid TV show "Hole in the Wall".
So, player will drive throuth track with shape and it needs to switch shapes (mutate) to go through holes.
As I was reading other participants diaries I find out that my idea has some similarities with malcolmt entry (http://www.pyweek.org/e/Hermit-42/). I hope he do not mind it.
You can try Proun it is pay as You feel type of game. Just be careful -- do not miss pyweek because of it.