There are no game hacks, they are not uploading pics to the game, they are using the shapes in the decal editor and overlapping them and reshaping them with lots of talent
and extreme patience.
Some of the better ones take 5 -10 hours to complete.
You can search the "Car Painting and Livery Design" section of the Forza forums.
This post has been edited by FCTE: Jun 7 2007, 05:42 AM