[Rockefella]

-Go to digimods.co.uk and go to the photoshop bible
-Go to http://www.astudios.org/2004/index.php?hau=tutorials
-Go to Car and model for High-resolution rims and bodykits/parts
-Use High-resolution car images: Try out Autogaleria.pl and go to Tapety (Wallpapers in polish)
-Check out Painterr's and Whiteballz tutorials.
*Thats about all, good luck.