Yes, in fact any breed can be mixed with the Araucana or Ameraucana to get an easter egger, whether they also lay colored eggs or not. EE's are simply mixed breed chickens that carry the blue egg gene and have an Araucana or Ameraucana somewhere in their lineage.
I thought maybe that was it but like I said, hard to tell for sure. So breeding little easter-eggers can be really fun as you can try all sorts of cross-mating!