I have a silver roan. It's a pretty wild color. She has a very silver body (kind of bluish gray in the winter, very silver blue in the summer) flaxen mane/tail, and diluted leg markings, but a very dark mask. She's registered as a silver dapple, because at birth, I really thought she was. The leg markings didn't become apparent until much later, and I don't know for sure, but I don't think silver roan is recognized anyway.
This is a picture of her as a foal
I don't have any really recent pics. If it's not raining tomorrow I'll go out and get a few. Her summer color is pretty much the same as what you see in the above foal pic though, except for smokey dark shading on the legs.
Forgot to add: Mom is a silver bay, and dad is a true, blue roan