One problem, how do you hang pictures on a brick wall without it being a big hassle and with out making a bunch of holes in it? Improvements Catalog to the rescue. I find whenever I have what initially seems like an unsolvable home improvement problem the solution can be find in the Improvements Catalog.
I came across these clever brick hangers that snap right on the brick and according to the product description can hold up to 25 pounds. I think they worked out pretty well for my needs though you kind of have to let go a bit about your exact configuration because you are limited by the location of the bricks.
Starting from top left and moving clockwise, here are the links to the prints seen in the photo above: Jessican Gonacha Swift, Traci French, Traci French, Sharon Montrose, Monko Photography, and Michele Maule. The lamp is from Urban Outfitters, the shade is Anthropologie, the white vases are vintage milk glass and the small white ceramic lamp is Pol's Potten from Le Souk.
I hope you find these quick home improvement and decor tips helpful.