Yes, I have one of those precious chickens too! An Araucana! Maybe it's genetic?!
Take a look at a post I made about my "special" blue layer!
https://www.backyardchickens.com/t/1082992/my-first-blue-egg-cracked-and-eaten
Many of the commercial hatcheries sell "Ameraucana" chickens, charging more for them. True Ameraucana and Araucana chickens are really quite rare and to guarantee the BLUE color egg you are best to purchase from a breeder. A lot of time from the hatcheries you will get that lovely MINT color...