Go with something light in color and smaller to make the room appear bigger. (You could buy 12x12 sheets of mosaic tiles.)
Also, be careful about choosing the color of the tile. Color schemes go out of style every 10-12 years. (Read through older posts & count how many people want to paint their tile because they can't stand the color.) You'd be safest installing white or beige - and painting the trim & or walls if you want to bring some accent color in.