Top looks to be a Cornish, but I'd need a closer picture to say for sure. Bottom left is Speckled Sussex and right is an Ameraucana. Unless the pics are misleading. I have the bottom two myself in standard size. They are not mixed breeds, unless you count that it's an probably Easter Egger really, as opposed to a true Ameraucana. What's throwing me is the feathered feet, though. That would indicate a mix, but hatcheries dont officially sell mixes except sexlinks. Wait, D'uccles have feathered feet and beards both so that is a possibility. A better pic of that one, too, would help.