Here is a detailed car vector illustration that I did based on some photographs of my old car ('99 Elantra). I designed it in Illustrator CS2, and specifically used blending modes to create the shading. The result is a fully "printable" car vector! Changing the base colour of the car changes all the colours. No need to manually go through and change all of the shading and highlight colours to match!
I hope you find a use for this awesome car vector!
If you dig it, swing by my website: www.echoenduring.com for other cool freebies and design related goodies!