What color should I paint my room?

I'm remodeling my room, I don't know what to paint my room. I have several posters, two are nearly all black, two are black and white, and the other has several deep colors. I have a black amp and a black guitar. I'm getting hard wood floors and base. I have a small black tv and its going to be on top of a kind of light brown drawer things. My bed is light green, I hate the color but whatever. My curtains are dark blue, and I have a Mexican flag hung up on my wall from a soccer game I went to (lol). I want my room to have like a really chill, calm mood. What should I paint it that makes it feel chill but goes with everything in my room?