You will probably get brown eggs or green. RIR is just a brown egg and probably won't change the color to olive. I have been collecting the bluest eggs my EE's lay. Their mate is a BCM roo, #5 egg. I plan on breeding the chicks back to a Lavender to see what color egg I receive. I saw some beautiful eggs on here and want an Emerald egg.Well I guess I will find out color the eggs will be in a couple months. I had to test my home made incubator this Spring so, I used the blue eggs from our 3 EE hen x RIR rooster. I was surprise - the chicks looked just like their EE mom when they hatched out. I now have 3 very pretty EE rooster and a hen that looks just like a RIR w/ muffs