A friend of mine did this and she got the idea from a magazine or such, I don't remember. Anyways, I finally caved and did it and it looks SO cool. I had to share and inspire others to join the craziness. 
Books before:
http://photos-a.ak.fbcdn.net/hphotos..._1065414_n.jpg
Books after:
http://photos-d.ak.fbcdn.net/hphotos..._3076238_n.jpg
These are just paperbacks. I don't have enough to do it with my hardcovers yet. LOL.

Books before:
http://photos-a.ak.fbcdn.net/hphotos..._1065414_n.jpg
Books after:
http://photos-d.ak.fbcdn.net/hphotos..._3076238_n.jpg
These are just paperbacks. I don't have enough to do it with my hardcovers yet. LOL.









Someday I may give that a shot! 

I guess they are somewhat by subject, but mostly just not. My dad & I just kinda have a mental list of where book X would be (or where to look for it first... then second... then third....) 

