Archetype Picture Ledge
These ledges from Crate & Barrel come in espresso and chestnut finishes and are all gorgeous! I've used six of the espresso ones to create a photo wall along my staircase, and another two chestnut ledges in another area to display art. They're quality, and they have fool-proof directions that involve an easy-to-level paper guide that you put up first, so that you are guaranteed a straight finished product. Highly recommended!