How to decorate a wall with pictures

Have you ever stared at a wall and found it looks naked? I have. In fact, I am looking at my walls right now and have the feeling I'mย in desperate need to dress up my walls - brighten up the apartment, give it a sense of style, and bring in a positive vibe. One of my walls in my apartment is colored - well, it's got a brown-greyish earth tone to it, not necessarily colored ...