decorating my room for a teen

Okay I am 15 years old and here is my problem we are moving house soon but we are only renting the house we are moving into so i can't paint the walls, i have seen the room i will be having and the floor is polished vinal type of stuff and the walls are white i want to make my room really stylish but i need help with ideas of what to do in my room, i have a double bed, drawers, a desk and a really tall bookshelf, i also have a collection of teddies but mainly beanie bears lol i'm obssessed with them. anyway what sort of things should i put in the room please help!!!!!!!! if it helps i like the colours pink, purple and blue