Who among us hasn't played Tetris? I think I played it first on my circa 1990 black and white gameboy.
This tetris inspired bookcase, available at Modern Tots, has to be one of the coolest bookcases I have seen. It is pricey, but the wow factor and the ability to configure and reconfigure the modular pieces justify the price tag.
Chose from a variety of exterior and backing colors to suit your decor. Each set ($750) includes one of the five shapes, so building the bookcase shown in the photo will require several sets.
(Hat tip: Babygadget)