This is the Emerald theme I made to match the Vicious Lime 2 GTK theme by Dan Bishop. I re-used his brushed metal texture from that theme, as well as some of the window decorations from the included Metacity theme. (The recoloring to gray for inactive and red for close is my own work. Also, the visual artifacts from scaling the images are my fault, if I have time to maintain this, I'll try to fix those.)
I recommend that you make sure Beryl is set up to display strong drop shadow effects as this theme uses little else to define the edges of windows visually. Indeed, with Vicious Lime 2 as your GTK theme it is difficult to tell where the window border begins and the window contents end. This is basically the effect I wanted.