I've been having a moment with leather laces, using them in all sorts of ways: as Christmas present ties, napkin rings, drawer pulls, and now the latest iteration, shower curtain rings.
I am forever tinkering with my home, making small edits along the way; since my guest bath is almost entirely white (tiles, walls, fixtures), I added texture and a bit of color to the space by replacing the standard chrome curtain rings with leather ties.
Above: You can source leather laces at your local hardware store, or order online (Tandy Rawhide Lace is $19.99 for a 20-yard spool at Amazon). Since the shower is rarely used, I haven't run into any problems with leather dye running onto the shower curtain, but I would probably not use the ties in a heavily used shower. I replaced the standard rings with 16-inch lengths of leather cord, knotted together.
Above: Source a Sturdy Duck Shower Curtain ($36.99) from Amazon.