I have an old pressure treated deck that the railings and deck are Benjamin Moore Cordovan Brown (dark brown). I want to change the color to a lighter shade like Thatch (B.M) I have a hill of grey rock behind the deck. I was thinking of staining the railings white and the deck Thatch. Would that take away the look of the grey rock? My house color is dark grey with white trim. I want the rock to stand out not the deck so I am leaning towards an all one color deck. Help!!