Both the Buff Orpington and the Barnevelder look mature enough to be laying.
The splash does not have a pea comb or muffs, so definitely not Ameraucana or Easter Egger. It's an Orpington.
You've actually got a Blue Marans, and a Splash Orpington. The one with the dark head and gold penciling looks like a Barnevelder. The Araucana are actually Easter Eggers. North American Araucana are never muffed/bearded, and they aren't the standard colors required for Ameraucana.