I never played Quake, so I never saw NPR Quake, a non-photorealistic variation on the orginal game. From NPRQuake – What is it?:
Non-PhotoRealistic Rendering (npr) is often considered the task of taking a 3d environment and displaying it as if it were (for example) hand-drawn. Stylization is the main purpose of an npr, as is with most pencil-and-paper artists (imagine if everyone who drew cartoons tried to make them look as realistic as possible – boring!). NPRQuake attempts to capture the elements of different drawing techniques, and immerse the viewer in worlds drawn entirely in the prescribed style. If you have ever imagined running around inside a painting or a drawing, you are beginning to get the idea.
They have sketchy, blueprint, and brushstroke renderers.