I can only think of St. Clare of Assisi and how she and the sisters of the order would were horse hair clothes as an act of penance. I think St. Francis did this too. I just imagine itchy, scratchy--ok, really, I think, "Why not a necklace made of fingernails? Or, a bracelet made of teeth?" I find nothing at all fascinating in jewelery made of body parts. I know in the 1800s and 1900s people made necklaces from human hair but honestly I think that was gross as hell too. Yuck!