Not sure what you mean by that, but here's what I know -
Cream crested legbar is an actual breed. When bred within themselves they should always produce blue eggs. Whiting true blue is another breed - they can repopulate themselves, and they lay blue egg. Starlight green eggers and prairie bluebell eggers are not breeds, they are mixes. The hatchery takes different breeds of chickens, and mixes them up, and selects the chicks that should have the desirable traits (for instance, blue eggs are supposed to go with pea comb), and then they sell those, but since the SGEs and PBB are mixes, they don't always lay the expected color.
Easter Eggers are an established mix, typically having beards and muffs, and they lay all colors of eggs, depending on which genes a particular bird happens to have. Each bird only lays one color of egg. You won't typically know what color that will be until they lay.
Hatcheries, to increase sales, have changed up the easter egger concept, and have been selling designer mixes, birds that do not look like typical easter eggers (no muffs or beards) but that are attractively colored and lay a certain color of egg. (Starlight green egger and Prairie Bluebell Egger are two examples - wide variety of feather patterns/colors, with "known" egg color) These chickens are appealing to folks who dislike uncertainty or want a targeted egg color. Unfortunately, not all birds who are sold this way lay the desired egg color. The hatcheries state on their websites which breeds are used to come up with the designer mixes, but I do wonder if there's more breeds in there than they tell us, and how exactly they do it.
Spirit
Friend
