While we're not exactly sure just how many people out there are still interested in such a thing, Codemasters, the GRiD developers, are holding a contest for its players to design a livery (skin) for the above pictured car. The rules are real simple and you don't need to be an art whiz or anything. Basically, download the picture package from here, and do your best to create an official "Codemasters Racing Team" livery incorporating the Codemasters logo into the design.
Going a step further, Codemasters artists will then turn that into game art for the car. And not only does the winner get his (or her) car in the game, but they also get " a load of GRID swag" and "a framed high-resolution render of your car as it will appear in the game." The contest ends July 25th, get designing!