Ideas for redoing a bedroom?

Hi. I'm a teen girl, and I'm looking to redo my room. I have decided on the color scheme of green and purple. I've also decided that I want dark wood furniture. But my room is where I spend lots of time, and I want it to be really pretty. I'm musical (I sing and play guitar, piano and cello) and like animals (own a border collie and a Quarter Horse gelding). Does anyone have any ideas of how to make it unique? Or some general tips about redoing a room? Thank you so much in advance(: