With recent changes to Blender api, now we can save themes in .xml format.
If you get a most recent build you will see in User Preferences > Themes >
In the left top corner the new Presets Menu
A new folder has been created here: 2.62\scripts\presets\interface_theme
or in test builds from graphicall or blender buildbot 2.62\scripts\addons_contrib\presets\interface_theme
from there you can load presets & save new themes.
2.62 Release Themes:
Blender 2.4x, by unhurdof, meta-androcto, ideasman42
hexagon, by unhurdof, meta-androcto
ubuntu by Ikeahloe
back in black by meta-androcto
elsyiun by unhurdof, meta-androcto
2.62 Contrib Themes:
2.62 default by meta-androcto
pinkified by venomgfx!
softblend by aermartin!
softdefault by aermartin!
maya by demohero!
zbrush by unhurdof
3dsmax by unhurdof, meta-androcto
thanks for your contributions, please let me know of any bugs, issues & most importantly, new quality themes.
color your blender