My favourite and most satisfying crafts are the ones I create to serve a specific purpose. These bookends are a perfect example, I couldn't find any that I was willing to purchase, so I decided to take matters into my own hands, literally.
Here are the raw materials: (plus my hot glue gun which isn't pictured)
I didn't have any heavy material to use, so I decided to use the weight of the books themselves to keep the bookends in place. The little cardboard tabs slip right under the books so you don't even see them.