We hatched an olive-eggers egg in the spring with an unknown roo - both blue egg layer and brown were possibilities. Nov 1st we were egg-cited to find a spearmint colored egg in the nest so we were sure our mystery chicken was laying. Our other birds have never laid an egg this color. (see pic for comparison)That has been the only egg to show up! Never had a pullet that went into lay for one egg and then stop - is it possible?