I would never even lift one finger to decorate a teen's room on my own. Not without their total input. However, remembering when I had my space back then. I wanted and got, a private place with lots of room. Enough room that I could create a little apartment if you will with seating, shelves. a tv and phone a nice big bed and then I decided on what color to paint, flooring, curtains, art work. Decorating is very very personal and if you put your style up for them they may hate it big time. They may feel childish that you would not give them the opportunity to express themselves. Hey they may want to paint the room black so get ready for some wild ideas, keep your own opinions in check.