The way a bookshelf looks can decide the line between nerdy and cool. Thankfully this chartreuse piece from CB2 is not only affordable, it's well designed. The X crossbars add stablility while the shape is a subtle nod to slope architecture. Just be sure to actually put dope books on it — which means hiding the Harry Potter and Twilight, genius.

CB2 Hancock Chartreuse Bookcase, $199