This is my first Emerald theme. It is based on the theme Utilitarian Smoke by euxneks, although just for the window buttons. I recommend to use it with dark gtk controls (I use it with Cillop-midnite). I have placed the buttons on the left, as it is expected to be the default behaviour for Ubuntu 10.04 and further. Enjoy!
(edit By the way, if you want Ubuntu Lucid to load Emerald with Compiz at boot, you have to edit with de gconf-editor the key /apps/compiz/plugins/decoration/allscreens/options/command and set it to "emerald --replace" (without quote marks). Otherwise, it loads gtk-window-decorator instead. For some strange reason, I also have to force loading of compiz at startup creating a command called "compiz --replace" at Preferences->Start Up Applications (or whatever it is called in English, I can't remember)