Candles in glass boxes - perfect combination of cozy and contemporary. Using flameless/electric candles for this would be a good idea to not have to worry about melting wax oozing into the bottom of the glass box and onto the other decorative objects
Using multiple varieties of wood leaves room for flexibility if you decide to change the furniture or floors. But you have to pay attention when you’re choosing the woods. The main goal of this kind of room is to create a harmonious space.