Ok.  Now this is just Awesome, all right?  This is my first car, a 1989 Celebrity.  It wasn't as dope as it looks here, but it was fun.  Just to see if I could, I scanned it into Photoshop and added the ground fx panels that you see below the black trim line, headlight and taillight blackouts, and tinted windows.  The tinting and the blackouts were a piece of cake, but the ground fx...they were a pain!  I did them all free hand using the paintbrush, the eyedropper, and the dodge and burn tools.  I'm pretty sure that I didn't even use masks or layers too much.  Photoshop was still pretty new to me then, but I think this turned out pretty fucking cool.
 

I had this pic developed and scanned by the lab, so this is the exact original that I started with, no color correction or anything.

Bit of a difference there, wouldn't ya say?