Current versions:
Eurynome: 2007-07-20-1
Nereid: 2007-07-20-1
Nuvola: 2007-07-20-1
These themes are for SeaMonkey 1.0.x and 1.1.x; 1.5a/2.0a/suiterunner trunk builds are not yet supported. Javascript required for installation; make sure Edit > Preferences > Advanced > Software Installation is checked.
After the theme is installed and selected, type "chrome://global/skin/about/about.html" in the urlbar for information on subskins, licenses (GPL & LGPL), etc.