This side view makes everything totally clear, as well as your buying them at a co-op. You have Easter Eggers. They are not Ameraucanas at all. Their color is not any sort of recognized color, and definitely not blue wheaten.
There are many things that make this bird not an Ameraucana, but the easiest and quickest thing to look at is the legs. Ameraucanas MUST have slate blue legs. They will not ever have pink legs or willow legs. Having willow legs will immediately make the bird an Easter Egger.
Here is a good link from Ameraucana Breeder's Assn. that will explain the difference between Amerauancas and Easter Eggers. http://www.ameraucana.org/faq.html
For future reference, you will not find Ameraucanas at a farm store or most hatcheries, no matter what the store or hatchery is calling them. Many, many hatcheries call their Easter Eggers Ameraucanas or Araucanas or Americanas, but it's simply not true. What those hatcheries are selling is a mixed-breed chicken that carries the blue egg gene. Often these birds are crosses between Ameraucanas and a breed that lays lots of brown eggs, which means that the offspring will usually have some superficial resemblance to Ameraucanas, as yours do, but will usually not be one of the standard colors and will often, but not always, lay green eggs. Because EEs are mutt birds, there's no way to know before the bird lays what color the egg will be.
Don't be too disappointed about having EEs. Although they are not showable (those willow legs are a DQ) they are great birds and often lay much better and larger eggs than Ameraucanas.