Actually no new artwork but some 'Ambiance' settings changed
- to create borders which enable easier resizing of windows by dragging the borders with the mouse.
- to paint the active window text orange for better differenciation.

Installation:
- Copy archive content into ~/.themes then use the 'Gnome Tweak Tool' (gnome-tweak-tool) to select GTK+ Theme 'Ambiance' and Window Theme 'AmbianceFramed' (see screenshot).