LOL! My four MPC EEs lay green eggs, but different shades thereof. DorisDoris lays an almost blue egg (and she has more Ameraucana traits), Matilda lays an Olive egg, Ursula lays a gigantic light greenish white egg, and ElsieJr. lays a light green egg.
Now.. it did take them a few weeks to settle into that (so, I disagree with the MPC quote above), and I still see slight color variations from day to day. Just like my Wellies sometimes give me a plain brown egg and other days give me a speckled one.