My listening room doesn't have walls to hang stuff on - its a finished attic. I still have some stuff from my days of stealing stuff from bars when I was a drunken college student -
Bass Ale mirror
Sierra Nevada light box
Knob Creek metal sign
A diverse collection of mirco brew brand bar towels
A ton of microbrew beer company coasters
A bar stool
The bar stool was the knock-out blow of the contest between my friends and I to see who could get the most outragous thing. I used to have a lot more stuff, but I donated most of it to my Fraternity house. Its still in the party area.
When I buy a home of my own, I'll use the bar stuff and most likely go with music posters and paraphenalia. I have no interest in home theater.
My first project will be refinishing an old coffee table I have, putting the coasters on top, and somehow sealing them with some polyurethane. I saw it done at a sports bar when I was in grad school, only they used baseball cards. I've got some pretty wacky and interesting coasters. When I was in college, they adorned my the walls in my room.
For the record - I haven't stolen anything from a bar in years. Those days are behind me. I do however aks the bartender for any interesting mirco/craft brew coasters that I see. When I tell them about my collection, they smile and hand me whatever I want. I currently have about 600 or so.