I know everyone is moving to the e-readers right now but I still like an old fashioned paper book (and I have so many unread books that I can't justify spending the money on an e-reader).
To make a Miniature Granny Square Bookmark for yourself:
1. Crochet 7 miniature granny squares - use a tiny hook and fine crochet thread (or 3 strands of embroidery floss)
2. Stitch granny squares together in a line.
3. Crochet a half double crochet border around the edge. Weave in ends.
As seen originally on Martha Stewart