Well, not sure if I should post this here or on Pro-touring.com as I am usually spend more time over there but since there are no submissions here I figured I would help getting the ball rolling here.
Here are three concepts I put together and later this week I plan to add some more. They can be tweaked or changed around as needed, but let me know what you think.
1st one uses several builds you have done.
2nd one (redefining the classics) includes some of the sponsors from your site which could actually be added to any of the designs.
3rd one (from concept to completion) uses a sketch of the car that morphs into the completedd car. Might be hard to see here, I can send it larger if you like. But the white part actually mimics a pencil sketch of the car.