I'd just wish I had my own room, same size as it is now. It's just decorate it differently. I have this japanese tea pot and tea cup and a sreen. It's like a wall so people woudn't see my 'private' corner when they walk into the room. I have my bed and bookshelfs there. And besides I change chothes behing that screen
Hmm... I'd move my computer table to the wall opposite by bed. Buy some more shelfs for my schoolbooks, this table where I can draw and do homework... mmm..
Lots of light coloured wood, and something japanese styled stuff ^_^