Well, that there is some murky waters. You can find people debating the whole "purebred or conforms to standard but isn't recognized color" for DAYS.
But truth is, Lavenders, Splashes, and several other project colors are being accepted by the breeders club (not as in APA accepted, but...
Sell them as Easter Eggers.
Unless yours will indeed breed true to a recognized Ameraucana color (look up the breeders club and see the photos, they should match the color almost exactly) and unless ALL your birds have either blue, black, or pinkish blue colored legs with white or pink colored...