Pure Ameraucana varieties have a goal to lay only blue eggs in ranges from blue-green to almost turquoise or pretty blue. However, pure Ameraucana only need to breed 50% true all the time to still be considered pure Ameraucana as long as other APA SOP standards are met.
The hatchery varieties are Easter Eggers labeled as mis-spelled "AMER--I--CANA" and are not of the correct label spelling of pure bred "AMER--AU--CANA" Both EEs and Ameraucanas are sweet birds but any bird that doesn't meet the APA Ameraucana SOP standard for egg color, feather color, body type, etc, have to be called Easter Egger.
Now, EEs are interesting egg layers. They can lay all sorts of colors -- many different shades of blue, blue-green, tinted, pink, brown, sage, mint, stone (grayish), and even WHITE! They are full of surprises.