When in doubt, go black and white. It’s easy to decorate a room by using a black and white theme and adding interest through varying textures and patterns. Use smooth accents like these ceramic candles or black desk to contrast with the elaborate mirror shown here. You can also use patterns to create interest (Etsy chevron rug and Urban Outfitters diamond rug).
Stylizmo is a great inspiration blog for black and white decor. Here are some of my favorites.