I have blue-green eyes, with one greener than the other. An eye doctor once told me mine were the first truly blue-green eyes he’d ever seen. I’m Irish, Welsh, Scottish and British, and both parents had blue eyes. My husband has brown eyes, however, and only our third child had blue eyes, to my mother’s consternation.
I think I saw somewhere today that at least 16 chromosomes have been identified as having something to do with eye color, and that an individual’s eye color can have nothing to do with that of the parents. (I’m the only person in my immediate family or among my grandparents who have green eyes.)
The link in post 20 mentions a place in China where most people have green eyes and blond hair.