This theme was designed to make GTK and KDE applications look more alike. No matter wether used under KDE or Gnome.
It was inspired by the Gnome theme Clearlooks-Olive. So if you're using Gnome it's a good idea to use it along with this theme in KDE.
Disabling/changing some of the green icons can also be a good idea if you really want the Gtk and KDE applications to look even more alike, regardless of wether you use Gnome or KDE. You might also prefer some of the usual colored icons.(See second screenshot.)
Finally I'd like to give credits to Plastik, the KDE-theme from which this is a modification. Enjoy!