There’s more ways to stack a bookshelf than the traditional alphabetical file in. Create several short groups of four or five horizontally stacked books, arrange covers by ROYGBIV (Red, Orange, Yellow, Green, Blue, Indigo, Violet) color coding, or opt for a combination of all of the above for an unexpected look that adds visual interest in any room. You can also place bowls and other objects on top of the stacks to take that idea to the next level.