Painting the Great Room

We are slowly working on painting the huge upstairs room. We had painted one wall a couple of months back, and now are continuing throughout the room. I'm hoping to paint one wall a dark grey for contrast. Still working on convincing Jeff. I would like to paint the wall opposite the new fire place the same dark grey. I think it will really bring the room together. For now we are slowly working section by section on finishing this great room. So many walls!