Kinda hard to describe but Saver Screensson creates stylish, unique patterns on your display by stacking vector stencils. Screensson contains 340 individual images and 19 predefined color palettes, generating countless multilayered compositions.
Take a look at the app that the OP is building. It's pretty interesting and uses this scripting bridge for generating OpenGL visuals. (http://github.com/aptiva/tranquil)
Might be cool to write a DAAP client that uses this so you get your Google Music inside of iTunes as a shared library. If I wasn't so loaded with stuff right now I might start a project. Oh, heck maybe I'll do it anyway.