A wall can be so much more than a boring empty surface existing just to hold a ceiling or separate a space and it certainly worths a lot more than an uninspired, flat frame!
Stick it, illuminate it, dress it, plant it, color it, use it to celebrate art and it will definitely pay you back!
But be careful: not every wall should have a story to tell. Too much talking can be disturbing and frustrating. Give the privilege only to those who are special either by shape or by their position or because the are lucky enough to be completely empty or contrastingly they have many things to hide!