I am going to love on another bookshelf idea for a second:
The symmetry and grid-look of this bookshelf looks overwhelmed by the haphazardly strewn books inside it. It’s so cute. I also love how big it is. And it would be so easy to make yourself, too. It’s other appeal is that you can throw all of your Kurt Vonneguts in one square shelf and your old English authors in another (or four or five). In my opinion, every house should be built with automatic size adjustments for wall-to-wall bookshelves.