Wow, I think it must really vary by the individual or particular line.... our SLW lays a medium brown egg that is always chubbier than a normal-shaped egg. That is, it's more round, less elongated. It's a totally regular brown-grocery-store-egg color and texture, though.
On the other hand, my Australorp lays the most beautiful, pale beige, shiny, elongated egg, and I know that most people's Australorps lay regular brown eggs. So go figure!!!
Stacey