1. add gorgeous yellow curtains. everyone knows yellow is my favorite color. make a statement with bright yellow. or, if yellow is too yellow for you, i think the black and white striped curtains are amazing in a home that you want to keep gender neutral.
via elle decor and domino
via little green notebook
2. paint the walls dark. it will make the rest of your things pop!
via country living
via splendid willow
via four walls and a roof
3. get an amazing rug
ikea has a similar rug
ebay has a ton of similar antique rugs
the madeline weinrib zig zag rug of course is my favorite
4. decorate with black and white things
via apartment therapy