Are there any 'car customising' sites out there?

Alrighty There People.

I'm after a site that allows you to customise a car, that has an extensive library of cars.

You know those racing games that allow you to add decals, custom paint, etc etc to vehicles? Is there any site that allows you to do that to any vehicle?

Here's my reason.

I currently own a van, and I'm looking to change it next year, either for another van, or a pickup, or something else. I want to play around with my advertising, to see what will look good on various models.

Is there anything out there?

Thanks in advance!