Many writers enjoy listening to nature sounds or classical music while hard at work on novels, short stories and poems, and some like to listen to white noise.
A friend of mine recommended this site to me: http://www.iserenity.com/. This compilation of sounds lists everything from a typewriter and dryer to nature sounds.
Pick one sound to listen to and use it as the setting/locale or backdrop for a piece of flash fiction (less than 1000 words). What sound(s) do you like to listen to while writing?