A great way to motivate yourself to keep a closet organized or to find a use for an awkwardly small closet is to wallpaper! You will forever after take great pleasure out of opening the door.
A built-in benefit of this treatment is that you likely won't need a mile length of wallpaper to do a small closet area, so the cost is less of an issue than when papering a whole room. Each of these images shows just what a large visual impact wallpapering a small closet can have. Have you done something similar in your home?