Will they let you paint it another color besides white? Mint? Beige? If not, hang up some nice large fabric on the wall or bed sheets of solid color and then put the posters over that.

You can go to youtube and learn some DIY (Do it yourself)

Heres some channel that you can learn some

Youtube Channel: Bethany Mota

I designed it when I was 8. It has pink and yellow walls and the roof is blue with clouds. I asked if I could repaint the room white but my parents said no. I tried puting up band posters and painting my desk and cabinets, but it still does NOT looks like a teenager's room. What can I do other than repainting and buying new furniture?