This is just the Emerald part of a fairly complete theme of mine called Soil (https://www.pling.com/p/1517069/)
I've changed the buttons, because pure Buuf buttons were too garish. Now they are more neutral, although the symbols inside are still buuf-looking.
Might create a version with more standard symbols so it can blend better with other themes.
Buttons are skeuomorphic (i.e. non-flat, with shadows and highlights). Active titlebar is green, while inactive ones are gray. Buttons have a greenish tint (the same that Soil buttons have, for absolute coherence). Hovering makes them colorful (not seen in the preview image)
The references to Buuf are from an icon theme drawn years ago by a wonderful artist called Mattahan (Paul Davey, http://www.mattahan.com/). I created a Linux version of this theme, using and remixing these icons (called Buuf For Many Desktops, https://www.pling.com/p/1012233/), and I've been updating it for many years, so it stays up to date with new desktops and new specifications.