I've got 3 flocks right now, but only 2 are themed. My layers are all flowers: Bluebell, Lily (rehomed), Clover, Daisy and Poppy. My Mosaics are Apollo, Star, Luna (now Leo) and the gone-but-not-forgotten Sol.
I kinda name them whatever pops into my brain.... Right now I have Buttercup (aka butterbutt) my very old Buff Orpington, Momma (my ever broody dorking), Nellie, Cotton, Big Bird, Slick, Fluffernutter and Dot. The last six are barnyard mutts!!
Not a theme since I let my girls and hubs pics the names of all but one. My little Lucy Diamonds is the only one I named because she was my only all white chick. Otherwise we have Sally, Katie (my daughters name is KayDee hubs chick pic), Brutis, and Taco.