1" - 2" wide ribbon
skinny hair bands
hot glue gun
needle & thread
Start by cutting your ribbon to size. Slide your ribbon into a middle page of your book. Wrap it around to the front cover and cut it (you'll want to have about 1" - 1.5" gap between the ends of your ribbon when pulled tight around the book). Keep in mind you'll have a stretchy band holding it together.
Next, fold your first loose end over top of your hair tie and hot glue it into place. Second, fold over your other loose end about 1/2" and hot glue it in place (this gives you a nice clean edge). Simple as that! Stitch a little button on the side that doesn't have the "hair tie" and put it around your book. You now have a new bookmark (and it only took you about 5 minutes)!
Now I just need to learn how to crochet...