Gray hardwood floors are hella cool. But are they a passing style trend, or are they here for the long run?
The grayer and less brown that you go, the more your wood floor will skew toward a modern, contemporary style. If your home and furniture are more traditional but you want to modernize things a bit, I would suggest more of a brown / grey or a medium brown stain with a slight gray undertone.
Benefits 
Grey floors are easier to keep clean than dark brown hardwood floors because they show less dust.
Lighter gray floors can make a room feel open and airy, while darker gray stains can visually reduce the space.
Dark gray floors do make for a dramatic contrast with light-colored walls, and dark gray hardwood floors also provide a perfect backdrop for brightly colored furniture and accents, such as red or teal. Gold and honey tones also complement dark gray hardwood floors.
Gray hardwood floors can look contemporary and sleek, or warm and rustic depending on the grade of wood (see Different Grades of Hardwood Flooring) and shade of gray chosen.
Grey floors have more of an urban, modern look…think funky furniture or minimalist contemporary styles. Turquoise and sky blue work very well with gray, and also white can be very striking depending on the shade of gray.
All pastel colors are lovely with gray tones, and really pop against the cool contrast of a gray wood floor.
Personal taste is unique to you! At the end of the day, if you just love gray floors, you will love them with any décor. Grey floors are not easy to achieve…the sanding must be perfect and the color is not an easy one to apply evenly. Grey floors are very striking and cool. All your friends will compliment you on your awesome, unique style.
At Wood Floor Planet we have a variety of gray wood floors…