Quartz Compositions on your Desktop
Using third-party programs like QCDesktop or Quartz Desktop, you can use Soundstream as your desktop background!
Both programs work in a similar way; after installing Soundstream and running either program, open or load Soundstream by selecting the appropriate menu item from the application icon on the right side of your menu bar.  QCDesktop loads the same settings as the Desktop & Screen Saver preference pane, while Quartz Desktop requires that you change the settings manually each time.
Soundstream on your Desktop
System Requirements:
  1. PowerPC or Intel Macintosh
  2. Mac OS X Tiger 10.4.4
  3. Quartz Extreme-compatible graphics card