Thanks! Easter Eggers are a hybrid between a chicken that contains a double blue egg gene (such as an Ameraucana, Araucana, and I think Cream Legbar, but don't quote me on that last one) and a light brown egg layer (like a Buff Orpington). Easter Eggers may come in all colors whereas pure Ameraucanas will only have certain colors. You can find these colors and standards here:
http://ameraucanaalliance.org/. Ameraucanas will only lay blue eggs, Easter Eggers will lay blue, green, pink, or yellow eggs.