There are plenty of options outside of the default off-white, and we went with Smokestack Gray. It's a solid color, is slightly masculine, it avoids both cliché and trendiness, and it absorbs some of that clutter and almost turns that bookshelf into an art piece. Big windows up front bring in plenty of light and keep it from looking like a cave. And that's actually Lead Gray in the foyer area up front, which is one stop darker on the color card.
Benjamin Moore colors used: Smokestack Gray 2131-40 Lead Gray 2131-30 Decorators White (trim) (Images: Mark Chamberlain)