Here’s a couple of screenshots (here and here) and the configuration and other files that go with them. Features include (pseudo) transparency, sound effects, randomly chosen background images, an invisible terminal in the lower left corner, programs that can be invoked by clicking on the edge of the screen, and extra info (date, time, uptime, todo list, randomly chosen proverb, whatever) cycling through titlebars. Nothing very complicated, just a few ideas I’ve picked up over the years.