What are some cool ways to design an empty wall?

So i have an empty wall in my room and i hate how its so boring. I live in an apartment and my mom wont let me paint it so thats out. Are there any cool things i could do? I considered hanging pictures but thats really un original.|||ok well still i no that u said that hanging pics are "unoriginal" but they're still cool, im redecorating my room, and so im going 2 get like a blank canvas and just be unique and paper mache it with like flowers(since that's the theme of my room) but u do what u want