I don't remember where I read it or exactly when I read it, but it had to be well over five years ago. Nevertheless, that one little sentence of advice is still stuck in my head to this day. It went something like, "if your room doesn't feel finished, add a touch of black". It's such a simple suggestion, easy for any novice to try out, and it got me thinking. What other tricks do the pros have up their sleeves? Here are a few design and decorating tips from the pros that could easily be the missing piece of the puzzle to rounding off your unfinished room.