Seconding rdj - not seeing an option to change board visual theme in my profile, I'm afraid.
Oh, and I still hope we keep the new fonts when we go back. I'm growing quite fond of this. <3
I actually don't like the main new font much - the edge of letters tend to be jagged for me. I don't know if that's my display settings, tastes, not remembering the previous one doing that anyway, or the font itself, but it's not my first preference.
And a more legitimate criticism of the theme: The background color is the same as the color for some of the 'boxes' used for forum posts, so there's no indication of the 'edges' there. (Like the box that's supposed to be around the posting interface in 'post reply,' if I recall correctly).