This magnetic bookmark tutorial showed up on Pinterest the other day, and it caught my eye because it uses the sew-in magnetic snaps discussed here and here. It is also super fast to make and I can always use another bookmark!
I followed the tutorial with two minor changes--I used interfaced fabric and sewed the snaps on before sewing the fabric pieces together. The 14mm snaps and weren't wide enough to catch in the seam during the topstitching. 18mm snaps would probably be perfect.
The finished bookmark is great. The magnet works through multiple pages.
This magnetic bookmark is a nice 15 minute project.