When Jeff built the shelves in our bedroom for all of my books I color-coordinated the filled shelves. Many Amazon boxes of books later, when the shelves were overflowing once again and - a mess; and it was driving me batty, exactly how clutter drivers me crazy, too - I decided I needed to do something about it.
I pulled all the books off the shelves. Dusted, because I'm not sure when the entire shelf system has been dusted. Then, re-arranged my books by genre, fiction and non-fiction. I even stacked a few series' together completely ignoring the fact, as hard as it was, their colors don't go together.
I displaced those books I won't ever read again to the living room. Although I'm unsure whether I'll get rid of them and if I do, how I might do that.
I love my system so far. When I am ready for another book I simply go to the fiction shelf or the non-fiction shelves for what am I reading next. Easy and fun page.