The GTK+ dark theme works by just copying gtk.css from Ambiance to gtk-dark.css to Radiance. Can't yet figure out how to make the titlebar dark, though. This a just a preliminary upload so I won't mark as a patch yet, as it is experimental (and I used it off a beta version of light-themes from Precise as I haven't upgraded yet.
The GTK+ dark theme works by just copying gtk.css from Ambiance to gtk-dark.css to Radiance. Can't yet figure out how to make the titlebar dark, though. This a just a preliminary upload so I won't mark as a patch yet, as it is experimental (and I used it off a beta version of light-themes from Precise as I haven't upgraded yet.