As a teenager my bedroom walls were completely covered with magazine pages, photographs, posters, and concert tickets. Back then I always wondered why adults didn't do this. Now that I'm an "adult" I no longer use tape and tacs to put random clippings up all over my home but I think that my old obsession with this practice has carried over a little (maybe more than a little). I still see the appeal of a little wall clutter when done right.
These are two walls in my apartment that have fallen victim to this obsession:
And here are a few perfectly chaotic walls that I have come by on Flickr, Fffound, and pearlsandtea: