Need help thinking of a way to decorate my room? And finding things?

I'm moving in July, and will have about 3 weeks to Decorate my room. My Dad says I can theme it as long as it looks good. I'm getting a queen bed (not sure if loft or floor bed.) I like the colors deep green(emerald green), black, deep red, and amethyst purple. I like music a lot and my taste ranges from techno to rock to some country to screamo/hardcore. I play the flute, and love photography. I need help thinking of a theme and finding things to put in my room. I'm 14 by the way if it helps any. I want a calm but still unique kind of look. Only a little neon if at all.