I get a few of these every now and then, wondering why and if it's common?
I used two different white balance settings on my camera trying to get a "true-to-life" picture.
They're usually white, but I've had a few brown eggs with green rings too.
Nice eggs. I don't get a lot of the red camo eggs like that. Mostly the polka dotted kind.
I do get quite a few solid white eggs, and it does seem like the shells are thinner on those.
I usually start mixing crushed egg shell into their feed when that happens.
Most of my birds are together in a large pen, so I usually can't tell which one lays what eggs.