One of the most underrated light fixtures in my humble opinion is the sconce. Mounted at eye level sconces create flattering light unlike the shadow lines created on ones' face from overhead lighting. Also, they don't take up precious table space like lamps or clutter a room like floorlamps.
This weekend I helped a friend install some antique sconces we had picked out at Artisan Lamp (my favorite lighting source here in DC) onto some existing built-in bookshelves in his den. The effect is magical particularly in this small room without any existing lighting!
Not only are they the jewels of the room, the warm light cast by them is ultimately flattering and practical. Don't forget sconces in your next project!