Excitebike for the NES baby!
I love that game!
you use Photoshop to make the texture map, elevation, and surface maps. texture is self explanitory. but elevation is done by grey scale. white is highest, and black is lowest. you use photoshop to make black and white gradients for jumps. its very simple, and if you are a graphic artist thats familiar with photoshop, then you shouldnt have any trouble making a nice track.
I began to think that may be what you were trying to tell us. Initially it sounded like you would create the final design and complete it in photoshop. But since you basically create a bitmap that converts to 3D using other software, that makes sense.
Hopefully we won't have to wait too long for the off road version of VRC to come out.