Welcome.
For those using Ubuntu 8.04 Hardy Heron default compiz or compiz --version > 0.6.* this guide should not be used.
For those who are using Ubuntu 7.10 Gutsy Gibbon and would like to have 3D Windows, Atlantis2, Snow, Stars, Atlantis, Screensaver, Anaglyph, Wallpaper, Tile, Freewins...