Over at the IKEA hacker, the blog devoted to turning IKEA loot into new and exciting things, a reader wrote in with a very clever Billy bookcase hack: I made an Ikea hack of my own a few weeks ago ...

Bookshelf tree Collette With an A-frame bookshelf and a bit of creativity, you can create a one-of-a-kind cat tree that will add a bit of style to your home.

First, you can turn an old bookcase into a cat tree where they can climb and play. Unsurprisingly, IKEA furniture is a great starting point.