When you cross a brown egg layer with a blue egg layer, you have a chance to get a green egg layer. Now this is something I have been told, so you genetics experts please feel free to jump right on in here.
i know the other way around,, with rir roo and ee hen,, you get a real dark ee thats rir colors,, kinda black and red,, with a beard,, hahahha they are cute as heck