slate - forget chalkboard paint, graphite, charred wood, or any of the other trending matte black surfaces. slate is the standard of all matte blacks and we have loved it since elementary school. but now that we are all grown-up we love it inside on our floors, showers & feature walls, and fireplace surrounds. when used outside on decks, patios or nestled into our mossy grounds. slate adds a touch of deep dark nature.