Get the look: Pick a theme, but keep it simple. Oskar is a self-described amateur astronomer, so a room like this definitely would be his cup of tea. If your child is really into a certain activity right now, let them go for it in their room. Themed rooms can be a little daunting, since inevitably they're going to have to be changed as your child grows. But you can still keep a theme low key. This room does a great job — a hand-painted star chart, planets above the window and a telescope in the corner are all it took to turn this into a dream room.