Old-old-old school developer (and hooved animal enthusiast) Jeff Minter put some screenies up on his Live Journal of Gridrunner+++, the Xbox Live Arcade port of Gridrunner ++. It looks like an acid trip. There's a sheep in the upper right of this screen, in case you were wondering. The other two are on the jump.
Shader-stuff In Game [Stinkygoat (Jeff Minter)'s Live Journal, via GamerBytes and thanks reader Ryan L.]