There's a current thread by Mark Burton regarding custom artwork Tshirts that he can do. I replied in the thread to a request to do a shirt similar to a late model Camaro shirt, but putting a launching Buick in its place. I made one up similar, although I'm worried about resolution as the original photo was pretty small. But it came out pretty good. I was thinking that if someone wants a shirt made of their car, I could probably do something similar to this one but with whatever text you want. I've made my own custom shirts, coffee mugs, etc using Zazzle, so I could do it and make the shirts available for your own orders. You would choose the shirt size, style, color, and material (I have one with the dual layer and microfiber). All I would need is a nice photo of your car, some idea what you want the image to look like, and anything you'd want written on it. The higher the resolution the photo the better. It's cleaner to scale down than up. Here's an example of the one I did and the original photo it came from:
Chris, The cheapest T's are the basic one in white for $14.95 (plus whatever shipping is). They go up into the low $20's for fancier T's in different colors. Sometimes you can find online coupon codes to save money too. For those do a search on google for zazzle coupon code. There are some here for free shipping over $25 and % off on numbers of shirts: http://www.couponmountain.com/Zazzle-coupons-deals.html If you have a photo you want to do, send it and an idea of what you'd like on it to me at seeverist at earthlink dot net