Thanks for posting! There are lots of ways to hang things on walls without making holes! Washi tape and Command hooks are great choices. You can use smaller hooks to hang frames or macrame wall hangings, or larger ones for larger items like tapestries! We used these techniques in the Dorm Room 3 Ways video last year, you should check it out for some ideas!
If you have any more details about your room, let me know and I can give you more specific advice!!