Kydex
In addition to leather I recently started dabbling in kydex, here's the result:
Above: A custom shell formed over the factory sheath of an Emerson LaGriffe allowing for low profile horizontal carry.
Above: This compact kit allows the Emerson LaGriffe to be carried in many positions.
Above: An all kydex sheath for a 6" Cold Steel Ti-Lite
Above: A leg drop expandable baton holder with quick release belt loop featuring an embossed rattle snake.
Above: A fancy neck sheath for a Kershaw Chive. I've also done one with a heart shaped cutout and a similar styled Emerson LaGriffe sheath with a cross cutout.
Above: A multi-carry sheath system for a custom JL Haynes fixed blade.