Thats a nice effect.... isnt there a "toon shader" or "cell shader" effect shader ( in the ultimate shader pack from these forums ) that has a similar effect to the above pic ?
Just thinking you might be able to get similar results using just a shader effect on ur objects/screen, without going to all the trouble of coding actual cel shading... ( if im thinking of the right thing in the shader pack of course lol -- and it probably wouldnt be quite the same, just similar, so would depend on personal taste i think as to if it was close enough or not.. )
If it ain't broke.... DONT FIX IT !!!