I may be off base, but I consider chicken flocks like a fish tank. There are certain breeds of fish that won't mix and will kill each other, or do serious harm. I view chickens the same way. Various temperaments won't work. I was initially going to maintain my 6 EE's in another coop and the new coop I am building (Which should handle 20 birds fine according to the FAQ Learning Center). I was considering moving over my EE's from their current pen to the new coop, once the new flock is living in the new coop, and the EE's who free range can integrate by being separated by the 15 yard run that the other chickens will inhabit so the older EE's don't harm the younger newcomers. That being said, I was originally considering Plymouth Barred Rocks, because my daughter liked their coloration. I think she is as excited, if not more so about chickens than I am. However, the Plymouth Barred Rocks idea is on hold. She is fond of the EE's just because of the diversity in colors. I am of the inclination that I want as many varied egg colors as possible. So far my EE's who have just started laying have given us 7 light green eggs. I wanted to put some actual Americaunas in there for blue colored eggs, some large brown laying hens. and some chocolate laying hens, to try to get the rainbow of egg colors (minus white). However, I want personalities to mesh, so my hens aren't killing each other. Thoughts, on the mishmash of breeds that would work on the rainbow of egg color gambit? I am trying to deal with one's that are heart and cold hardy because of the East Texas weather is hot and humid and can be cold and blustery for it's short winter. The coop is well ventilated and the backside faces the North Wind and the open area to run back and forth from coop to run at will faces south, so that should keep them out of the elements.