Pick the best walls
Limit how often and where you decide to paint your walls a darker color. Walking from a light room to a dark room changes the mood that is given off. Because of this only have a dark wall in a few select rooms rather than the whole house. It will create the best and most positive effects.
The finish on these walls can also have a big say on how the room is interpreted. Shiny walls make the room feel glamorous while in comparison a matte finish makes the room feel more urban.
To make the most out of whatever dark color you decide to put in a room add even more colors on top of that. By having a dark wall in a room you are actually allowing for other colors to have a greater statement. Added bold or bright colors will make a larger impact. This also applies to art that you hang in the room. On the darker background it create more contrast and enhances what you are trying to show off.