There's many ways to give your room a brighter look instead of having a moody feel to it, Paint it the same color as the wall to create a break in the wall. This will allow light to hit it at certain angles causing shadows and contrast- even when painted the same color.
-Use a room that receives plenty of natural light.
-Keep the floors a lighter color.
-Utilize area rugs
-Decorate the walls with complimenting paintings and fixtures.
-Use base and crown molding. Paint white or a lighter color to break up the dark walls.
-Keep the ceiling white or a much lighter color.
-Keep the furniture lighter or with accentuating bold colors. But steer the furniture colors away from the same color as the wall.
-Mirrors on the opposite side of a window that received a lot of light.
-Utilize a moody wall, rather than an entire moody room. This basically means painting an accent wall a dark bold color.