And those with some artistic skill can be a part of it. They're having a contest in which people can enter their own car design to be included in the game. So, if you can work magic on a 3D-modeling program, or even just are highly-skilled with Photoshop, this is the contest for you. Not only will the winner have their car in the game, but they'll get $2,500 too (and possibly a job offer, if you're good enough).
Here's a sample from the Test Drive Unlimited website:
Here's the contest link: http://www.atari.com/tdu-contest/