Some people think that this is the best dark theme :)
Ported to CM12: https://play.google.com/store/apps/details?id=com.lex.theme.lessugly.cm12
Important Note: Only for use with new Theme Engine. A custom rooted ROM with Theme Engine is required to run this application. If you don't understand these terms, this application is not for you.
Theme is compatible with CM11/PA (and every other rom with the new Theme Engine included).
Works best with xxhdpi/xhdpi screen resolutions.
Additional links:
LessUgly Blue: http://goo.gl/pQ5uam
Cryten Icon Pack: http://goo.gl/FpMvE6
New wallpaper by Eric Rösch. More of his work can be seen here: http://goo.gl/n8oj71
Old Wallpaper by Adrian Petrisor: http://goo.gl/yPizNS
p.s. This is not the best theme. Just less ugly than others.