A while back I decided that I needed a new bookcase for my ever-expanding stash of tomes. I went looking online for a recycled cardboard case in the hopes of saving money… and then I decided that I might as well cut out the middleman. I found an eBay account selling 40x20x11cm cardboard boxes, which were just the ticket.
A little bit of parcel tape to reinforce them, and I was good to go!
Top to bottom: horror shelf; science fiction shelf; horror shelf 2; feminism shelf. I had wanted a history shelf as well, but ran out of boxes and so had to make do with the unused space in feminism and horror 2.