Based on Aqua-v5 round: http://gnome-look.org/content/show.php/Aqua-v5+metacity?content=99458&PHPSESSID=6
There are two versions: the one to be used w/ close, min, max on the left side and the '-r' one to be used w/ those buttons on the right.
This theme uses your GTK theme color and should work properly with all versions of metacity.
It's my first theme so I'd be very glad to see your comment telling me how to improve it. However, enjoy the theme!!!