This instructable will help you make a nice picture ledge, or shelf, out of a piece of crown molding and a few small pieces of lumber.
I have probably made hundreds of these since I saw the first one at an arts and crafts show in Austin, Texas. They are literally all over my house, my in-laws all have some, most of my neighbors have a few...... I have given them as gifts to lots and lots of people. They are really popular.
This is a low cost project, but there is a bit of work involved. Set aside a few hours and make a few of them, they look great if you make a few in different lengths and stagger them on a wall.
If you want a few, but don't want to make them you can of course visit my Etsy shop at http://www.etsy.com/shop/HoodWoodWork