The Joys of an Idle Weekend
Back in the late XXth century I used to be a big fan of the Persistence of Vision Raytracer (aka POV-Ray). My general lack of design taste, at best very fuzzy understanding of what I was doing, and a sluggish P166 combined to keep me from ever doing anything really good with it, but still I toiled the nights away making shiny metal balls that would reflect checkerboards in misty mornings.
You can go play with the test page and grab the source code if you wish. Note that it doesn't produce the image until it's done with it, so you might have to wait in front of your browser doing very much nothing for a while. •