What's the best color to paint a room with a slanted ceiling?

I just got a new place and it’s great but I need to paint the upper floor. It has a fairly high ceiling at its peak of 9 feet but the color is an ugly brown not unlike the Fluther color. I’m thinking of a nice warm off white from floor to ceiling with no break between colors to just open up the space. Anyone have any other ideas or experience with a room with a slanted ceiling?