Cell shaded texture

Well hi everyone.

I'm trying to figure out how to make a cell shaded texture. Now I've seen the two prim and full bright methods... but if you look at cell shading, you'll notice that the shading is still there, but it's not smooth shading, it goes from stright light, to straight dark.

Now I put this in this thread because I know in some animation programs, if you put certain atributes in the texture fields, it'll make it so that the shading is as I described. Does anyone know if this is doable in SL.

ALSO:

Can we make cell shaded avitars? I know it's a bit harder because you'd have to do it to the skin which I don't think works like an opbject... well you'd have to do it to the skin and the hair... and the clothes. Is this possible? Thanks.