Years ago I had a hen that laid a light green egg. Until of course you took it inside and then it looked brown. Outside green, inside brown. LOL darndest thing that I have ever seen. She was a mix of Madagascar game, Black Giant, EE and OEGB. Just didn't know what she wanted to be when she grew up! Only have one green egg layer on the place now, her granddaughter. and I think she is like 6 or 8 generations out from the odd egg hen.