The striped one came out of a green egg. The others out brown eggs.
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We can't really tell you what they could be mixed with until they are feathered, though the green egg chick is almost definitely an Easter Egger mix - a chicken with Araucana or Ameraucana bloodlines. Here is a wonderful link explaining the difference between Easter Eggers and the other blue or green egg layers.
http://www.the-chicken-chick.com/2011/09/ameraucana-easter-egger-or-araucana.html