Ideas for decorating my apartment for next school year?

I am moving from off campus housing where I had a lot of decorating freedom to an on campus apartment where my room is very small and comes with a twin bed, desk, and wardrobe closet. I want it to be cute and cozy, but I need ideas for how to decorate it! I don’t want any of that cheesy hot pink dorm room stuff they advertise, but I do have girlie taste. I kind of like black white and red, but I also love vintage looks. I can’t paint or hang anything on the walls either, so I am thinking maybe a wall decal or some sort of fabric hanging. What would you suggest? Links for room ideas would be so helpful!!!! Thanks so much.

Other decals sites

• Have Top Quality and Efficient Bedroom through Wardrobe Systems | Words That Rhyme
• The Modern Wardrobe Closet « Otis Lauderback
• Apartment Hunting Tips for Parents of College Students | Oh My Apartment