Hello Silverquest!

Just take your normal textured model and make a copy. Then texture it completely black, flip the normals and scale it a bit. Now put that model over your smaller one. This gives the effect of cel shading. Here is a thread regarding to this:

http://www.conitecserver.com/ubb/ultimatebb.php?ubb=get_topic;f=1;t=003484#000001

Hope that helps,

Florian