Check it out! Tetris Modular Shelving. From the site:
The Tetrad Flat Shelving is a modular, lightweight shelving solution consisting of 5 different shaped blocks with wooden sides and colored metal backings. Blocks can be attached to one another, to the wall or left free floating for life-sized, living room game play. And no, the bottom line doesn’t disappear when you make that perfect configuration.
You can even pick the color for the backing (white, brown, blue, green, yellow, and gray). $1315.