An IMHO nice dark color schema with some blue highlights in the buttons.
The colors are somewhat modeled after the colors of the freedesktop.org logo, hence the name; I like their blue .
If you use Emerald, I suggest this window decoration to go with it: http://kde-look.org/content/show.php/Emerald+Aurora+Elegant?content=85454

As most dark color themes, this one,too, has some limitations, e.g.: The "Window Text" color is set to white, but some programs (like Kontact in its overview module) assume it to be black (or at least not white) and just puts text in this Window Color on a white background. Also -- if you use the GTK-Qt-engine -- some of the colors don't seem to be right in GTK apps.

Suggestions are very welcome .