One of my favorite bloggers posted about this necklace available on Anthropologie's website a few months back.
http://www.anthropologie.com/anthro/catalog/productdetail.jsp?id=20860656&catId=JEWELRY-NECKLACES&pushId=JEWELRY-NECKLACES&popId=JEWELRYACCESSORIES&navAction=top&navCount=354&color=000&isProduct=true&fromCategoryPage=true&isSubcategory=true&subCategoryId=JEWELRY-NECKLACES-PENDANTS#BVRRWidgetIDIt was retailing for something like $165. I figured it would be pretty easy to diy. So I did.

First, I looked around my house for leather-like items to cut up for the covers. I had a bag that my dog had chewed the straps on. I had an old placemat that I had purchased to make into a purse.

I remembered an old red purse I had that would be perfect. My dog had chewed the straps on it, too. Then I remembered that I had finally thrown it away. I kicked myself. Then I headed to the thrift store.
I found an old green purse for a few dollars. A few dollars was more than I wanted to pay, but still considerably cheaper than the Anthro necklace!

I set out molding the pages out of white fimo that I had laying around. I scored the sides. I poked a hole in the middle. I baked them.

I sandwiched them between the cut leather and mashed things around a bit. The "pages" cracked.
Time for round two.
I did some reading about the Anthro necklace, and found a similar one on Etsy. The shop-owner on Etsy was selling actual usable books. Made with real paper!
So I started cutting up books.

I cut and I cut and I cut! And then I used a needle and poked a hole in the middle. I inserted a headpin through the middle, found a suitable chain, and voila!

I love it.