I would be happy with one breed, which would be my Dorkings, but my husband HAS to have brown eggs. I think that's silly but need to keep him happy. I tried the Delawares and fell in love with them. Awesome egg layers, great meat and very pretty birds.
Being serious about breeding, I got rid of all my mixed breed chickens to focus on these two breeds.
We sell eating eggs to help with the cost of feed. My husband mentioned that his egg customers have requested blue eggs. I said no. Then a friend got a new breed that is supposed to lay blue eggs in quantity and quality of a Leghorn. With chagrin, I admit that I now have one UofA Blue hen in my flock. The hen is vigorous, seems to have a decent temperament and integrated fine into the flock of chickens out on pasture. She lays pretty blue eggs every day or two, a bit small but she's only a few months old. My husband is thrilled to have blue eggs to eat.
I'm mentioning this to let you know that there is another breed that lays blue eggs. You can find their thread here on BYC.
My apologies to Bob and all, for bringing this up on a Heritage large Fowl thread! I hope you all don't consider me a chicken collector now.