These fabric letters from Zara Home have little hooks as well so you can hang them separately on little pins or wire. I put them on a wall in A.s bedroom just using a glue gun. The painted wallpaper in there (which I normally hate) proved to be quite good as is thick and the glue didn't damaged it. When putting on the wall in frantic pace I had to stop for a minute and think what's first if Q or R. Shame on me. Back to school I say.
A. loves it. If you have time this can be a very good and cheap DIY project. You can buy precut MDF or cardboard letters and covered them with remnants of fabric or different bits of paper. Have a great day!