I certainly appreciate all the responses. But now I am more befuddled. I am getting 2 green eggs daily. The Brahma isn't laying (she's broody) and I'm sure she is pure bred. Could it be that my Wyandottes aren't pure? They have rose combs. Is the pea comb a close cousin? I'll have to examine these girls tomorrow and see who is fooling who!
I have two EE's, one has a rosecomb and one has the peacomb. The one with the rosecomb lays a blue egg and the one with the peacomb lays a green egg. So it is possible.