My brother recently got a Shield and is interested in a Kydex OWB holster. I've always leaned towards leather for that myself. After a few searches, I thought I'd throw it out here for discussion. The usual cast of characters Blackhawk Serpa, Comp-Tac Belt Holster aren't available.
I did find this one: Eclipse Holster :: OWB Belt Holsters :: Blade-Tech Industries that is available for the Shield.