I'd do the blue ameraucana because of the blue egg genes. That would give you all green eggers.
With the marans just for the darker brown egg genes. Giving you 50/50 dark green/dark brown eggers.
Maybe with the barred rock. Which would be 50/50 green egg/brown egg but they would be sex linked so...
With the welsummer cross you have a 50/50 chance of offspring laying dark green or dark brown eggs.
With the EE cross 75/25 of laying green eggs/brown eggs.