Here is my latest desktop:
these are the new elementary gtk theming from elementary development PPA:
yeah it has great compatibilities both gtk2/gtk3...
and you could see the new file manager of elementary called "Marlin". I've never seen such great theming, never! actually some issues had remained on tooltips and gtk menu outlines, but almost is freakin' nice, you know?!
I love their amazing work for it... :) this theme must be employed gnome3 default gtk theming instead of fxckin' Adwaita.