Yup, after this post gave it a bit more publicity, Bruce William's theme was shown to be a clear favorite - another 150 folks have gone to the effort to manually switch over their default theme selection to his design. So now it's the default theme on RubyForge! Nice work, Bruce! Long shall your name live in lights on the credits page!
And of course, if anyone notices any problems with this theme (or anything else), please post notes on the support trackers, thanks!