I put a ring on a Little Free Library on my street in Culver City, CA. See
http://littlefreelibrary.org/ for info. I love the idea of sharing books with neighbors in this way. It’s sort of like yarnbombing, but with books instead of fiber art pieces being placed decoratively where you least expect to find them.
The ring is crocheted with acrylic rug yarn and sewn onto a coat-hanger wire frame which extends into the ground at the base of the library. The ‘jewels’ are mid-20th-century glass buttons collected by my mother (1915-2013), and sewn on with faux mother-of-pearl beads from a worn-out ‘scrunchy’ hair ornament.