@Safetyman and tjindy: Thank you both! The settings are pretty simple really:
Basically what I have here is a flat black/no specular material, AA at 16 to get rid of choppy bright lines, and Edge turned on and made a yellow color. What the threshold does is show more or less of the lines of your object. So here I have it at it’s highest setting(255), but a threshold of 1 will barely show the outline of the Suzanne, and hardly anything else, so play with that for sure. I also have a subsurf of 3 on the monkey, merely because I like the high-poly look, but that is up to you as well. There are no lights in the scene at all. BUT, you can use lights AND specularity and get a totally different look.
Here I used a regular material on the floor (without spec, but a little bit brighter than total black), and lights. So what we have here is the Edge effect on the guns, but shadows on the floor as well:
All of this renders in seconds by the way, no matter how many polys you have in the scene. Lights/shadows/spec will take a bit longer to render, but not very much. Have fun with this, and thanks again!
Here’s one with flat black/blue spec, one area light, and Edge made orange and at 255: