Why wouldn't you? $5 DIY prettyness.

RIBBON BOOKMARK

What You'll Need:
A ribbon
A hair elastic
A button

How To Make It:
1. Measure a piece of ribbon long to wrap around one side of a book. 
2. Fold one end of the ribbon over a hair elastic and sew it in place.
3. Sew a button to the other end of the ribbon. 
4. Wrap the ribbon around your book and hook the hair elastic around the button to mark your page.

Compliments of here.