I sheepishly admit to not knowing that are more chicken egg colors than just white and brown up until recently. I became aware of this in my mid-50's when I was doing some minor modifications on the chicken coop of an early (and wealthy) Facebook employee (he spend over $30,000 to build an elaborate chicken coop to entertain and educate his young kids, only to find out afterwards that the kids were scared to death of the chickens. Oh well. Easy come, easy go). In the coop were bluish and green eggs. I assumed it was either a practical joke, or eggs leftover from an Easter egg hunt. Nope:
What Chickens Lay Green Eggs?
Its a little odd that mainstream grocery stores seem to not carry colored eggs. I would think they would be a big hit.