Marans lay dark brown, but I'm pretty sure none of your birds are Marans. It does look like you have a Legbar, though, so she is likely your green egg layer.
Your two Production Reds and the Barred Rock should all lay medium brown eggs.
I finally caught her in a nest and later found a green egg but.....not sure if i remember if that was the nest because there was a brown egg in the next one :-( i am about 90% sure my black hen laid the green egg. Maybe i should try geese i hear some lay golden eggs :-) she is bigger now and really pretty. Ill get another pic and post it so you can all try to figure out what she is.
I am now. I caught her in the nest, took note of the nest and found a green egg in it later :-) here she is: