So my friend and frequent GM Wes is a professional sound designer, and he recently started making these awesome mp3s of thematic background sounds for our games. So he'll make it sound like we are in a dwarven city or a tavern. It really helps add to the game.
He recently decided to try out a kickstarter to see if others are interested in getting his background loops and to help him make more.
I just backed it and I hope you will too!
http://www.kickstarter.com/projects/1281758745/professional-mp3-background- loops-for-role-playing
Thught I'd mention he has hit his primary goal and his first two stretch goals. You can now get 15 different MP3 Background themes for $20