QtCurve with custom colors and widgets configuration file: https://github.com/numixproject/numix-kde-theme
You can load these files in the Systemsettings. If you install the icon packages you can select these there.
GTK 2/3:
There is an option for setting GTK Themes in my KDE distribution - set GTK2 and GTK3 to Numix. The GTK themes and icons are in a an PPA: https://launchpad.net/~numix/+archive/ppa - you have to disable the option to apply colors to non-kde Applications as the themes are slightly different and this will cause problems.
I've tried this with Ubuntu 12.04 and did not get it to work (not GTK3 options) but it works really great on Ubuntu 14.04.
KDE:
QtCurve with custom colors and widgets configuration file: https://github.com/numixproject/numix-kde-theme You can load these files in the Systemsettings. If you install the icon packages you can select these there.
GTK 2/3:
There is an option for setting GTK Themes in my KDE distribution - set GTK2 and GTK3 to Numix. The GTK themes and icons are in a an PPA: https://launchpad.net/~numix/+archive/ppa - you have to disable the option to apply colors to non-kde Applications as the themes are slightly different and this will cause problems.
I've tried this with Ubuntu 12.04 and did not get it to work (not GTK3 options) but it works really great on Ubuntu 14.04.