One of my Easter-eggers lays a super pretty blue egg as well.

Most of mine have been green-eggers, though, or super pale blue. It's really luck of the draw with them.
The Easter-egger in question's egg is on the right in this picture; the egg on the left was from a Silkie x Easter-egger mix I have.
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I don't actually own any Ameraucanas, for the record. I had a Blue hen a few years back, but she got sick and passed away pretty young, and I just haven't had the opportunity to get another one since. But I do love the breed and want to get more eventually, which is why I was lurking here in the first place.