Painting with Polygons
This video is a couple of years old now, but it’s a well-done presentation that’s worth watching more than once.
It’s a nice example of using tools in ways their authors probably never intended.
From the video’s description: “Most non-photorealistic rendering solutions tend to involve brilliant but unwieldy new technologies, such as volume-based rendering engines or complex image analysis. Similar results can often be using simpler methods and non-proprietary toolsets, even toolsets designed with other effects in mind. Our studio has been experimenting with ways to achieve a hand-painted look with basic tools that are common to most 3D applications, in this case Lightwave. “