Pyle refers to a few things, but most often refers to the "Red Pyle" Red Pyle is duckwing with white, usually dominant white. Lemon Pyle is buff columbian with blue or splash. - Usually found on Brahmas. Blue eggs - No definite experience on it yet, but to me it is mainly about trial and error. Testing. Breeding different parents together, keep note of the offspring's' egg color, and see who does and doesn't pass on the green. Don't keep green laying parents though unless you NEED something else they have. If they continue passing on 100% green offspring, you're in for a trip. I'd say treat it as an issue like clean faced vs muffs/beard. Get rid of the green egg layers, test the blue egg layers for if they pass on green. If they do, change the parentage to see which parent or if both continue passing it.