Quake-Sketched...

<A target="_blank" HREF=http://www.cs.wisc.edu/graphics/Gallery/NPRQuake/sketchyNPR.html>Play Quake like it was pencil-sketched</A>
Much like the cel-shading method used in more recent games such as Jet Set/Grind Radio, someone made a mod for the original Quake that makes the game look pencil-sketched. I had a feeling the method is not too difficult and the description this person writes on getting it to work keeps me in that line of thought. Anyways, if you have the original Quake, you might want to check this site out.

-Chanchai