It's not a new idea, but it's a good idea: bedrooms painted in moody shades of gray, dark blue, graphite (especially when contrasted with white design elements). Below find some ideas for recreating the look.
Above: Northern California company Serena & Lily has a new line of paint, featuring shades like Steel ($45 per gallon), available directly from Serena & Lily.
Above: The walls in Jenna Lyons' Brooklyn bedroom are painted in chalkboard paint; for a similar look, try Tilano Chalkboard Paint in Goodnight Black (available in other shades as well).
Above: This atmospheric bedroom features walls painted a deep blue shade called Hague from Farrow & Ball.