This theme is a darkened variation of the CurveDomina-Respin theme (http://kde-look.org/content/show.php/CurveDomina-Respin+QtCurve+theme?content=138886). I was surprised that this theme still looked good with a dark color scheme, so here it is.
Disclaimer : I haven't tested it with active compositing (not much love between Kwin and radeon driver).
- import style in the QtCurve settings
- select QtCurve as window decorations manager
- import color scheme in the KDE color settings