newgrounds.com recently had a game jam where there was a call for artists' game concept submissions.

This is one of the two submission I had made (avaialble under public domain) This concept draws influences from the old school game ExiteBike

See the original game concept here http://opengameart.org/content/motorjoust-game-concept

Ajay Karat | Devil's Work.shop http://devilswork.shop