I adore this photo. Not only are the books organized by colour but by size too. Love the graphic effect.
Here are some more I really like. My favourite are wall-to-wall bookcases. But there are a couple of smart ideas below for books that maybe aren't the greatest to look at. Such as the third photo. Place a REALLY nice chair in front of your books and no one will even notice them because they'll be too busy admiring the chair. Or in the fourth photo - just turn the books around so the spines are facing backwards.