Thanks for this—it's great! I went ahead and tweaked your modification a bit and elaborated on it, and now it's available on GW as a selectable theme (note the theme selector widget at the top-left of the page).
Any further suggestions on improving the theme are welcome! (See here for the grey-theme CSS as it currently stands.)
P.S. If anyone else wants to post or send us additional alternate themes, please do!
Very cool, and thank you for cleaning it up!
I'm not very happy about the typeface used for body text, the longer paragraphs kinda make my eyes bleed. Arial at 1rem would look more scannable to me. But this might be subjective, and in any case I can just fix it for myself.
Might as well go with a bang.