Following up on my earlier article of designing mostly with black or dark grays, another option is to limit the darker colors to just the flooring and/or accent pieces. Accent walls are also a possibility but it really depends on the layout of the room, the direction of the natural light and the function of the wall in question. Dark accent walls are particularly effective in workstation areas because they limit the reflectivity of a lighter wall color when staring at a computer for extended periods of time.
The downside to dark wood floors is that they need to be cleaned frequently. A cerused finish on dark flooring is a great option if you are concerned about maintenence. If you have existing wood floors and do not have the budget to purchase new flooring, they can always be sanded and refinished in a darker color which will completely transform the look of the space.