Would a deep purple painted wall look too dark against wenge furniture?
Dark colors will have a tendancy to make a room look smaller. Instead of painting the whole room that color, you might try just having the Headboard wall be an Accent wall. Paint the other walls a lighter color (one that goes with your purple). One more thing – colors have an affect on your moods. Darker colors tend to put you in a sullen mood and I am not sure you want to do that in the bedroom!