I have a Welsummer and some of her eggs are speckled. She's inconsistent. Sometimes it's so many tiny speckles that the egg looks all one color, like a light coat of spray paint. Other times it's blotches.
Some of the welsummer eggs in my bator are speckled.
And my Barred Rock occasionally lays a speckled egg. It's her normal light beige egg, but looks like someone splattered lavendar paint on it. Got one of those today.