What colors do you like? What color is your flooring? Does your bed have a headboard? What color is it?

It is often easiest to choose a bed covering first, and then select paint color(s) from the bedding. Seems backward, but it really is easier to custom match paint to something you already have than to try to buy something to match the walls.

Have you looked at the PHOTO section of Houzz? Click on PHOTOS. Scroll down and click "bedroom." Enter "teen girl" in the search box. You can put your favorite photos into you very own Ideabook. Make notes in the comment box about what you do and do not like about each room. When you get about 20 photos, you will be able to see similarities between them.