Unlike ordinary strips of ribbon, old receipts, or business cards, a magnetic bookmark wraps around the page you're marking and keeps your spot without slipping out using the magical powers of magnetism. It leaves those prone to dog-earing pages unable to whine that they keep losing their bookmarks and spares them from the wrath of aggravated bookworms.
A single magnetic calendar can be made into several bookmarks, and they're easy to make, so why not give someone a pleasant surprise by leaving one in a book?
Check the link for detailed instructions and tell us about your favorite book (or bookmarking) hacks in the comments.
Recycle Ad and Calendar Magnets to Make Magnetic Bookmarks [Craft Chi]