EEs are suppose to lay blue/green eggs, but some of the ones from the hatchery lay "pink" eggs. I have a RIR that lays pink eggs...it's just a pink colored film over the brown.
Technically the egg is not pink. I have learned that there are only three colors of eggs, white, brown and blue. Some say that the brown is not an actual shell color, but a pigment added to the outside of the egg, that is why the inside is not brown. That makes sense. Everything else is a mixture of those colors. And if you think about it, it is true. But I think an EE can lay any color egg. B/c they are not a true breed, anything can come out.