What do I get as far as egg color when I cross an Easter egger with...

[Chickengirl1304]

A black copper marans
A RIR
A barred rock

 

[nicalandia]

A black copper marans
A RIR
A barred rock

EE can lay many shades of green and some even brown, all the breeds you posted lay shades of brown, so if your EE has the blue egg gene and has some brown egg trait in him/her I would say, they would lay green eggs of different shades, and close to Olive with the maran