"If I paint my room a dark color will it make it look smaller?" I hear this question a lot. The answer is "no." Really!
Here's the deal. Contrast between colors (light sofa, dark walls) makes a room appear/feel smaller because your eye stops and starts instead of continuing through the room as it would with a dark sofa and dark walls.
Do you know what dark paint does to a room? Makes it dark! Just keep that in mind as you paint a windowless room or a room without a lot of natural light. Dark is okay if that's the feeling you want and you aren't surprised by the results!
Just a Monday morning painting tid-bit for you!