A slightly less orthodox (i.e. not just square or with rounded corners) window decoration, based on Overglass Mod by IBBoard (me), which was based on Overglass by Cesus, which was based on Bukowski by downdiagonal.

The theme takes Overglass Mod, reduces the transparency of the borders, alters some of the shades to better fit with the new openSUSE Sonar widget them, and adds a slight gradient to the bottom of the buttons so that they appear to be coming from behind the main content of the window (which means they fit with all windows whether or not they have a dark menu bar).