According to The Journal of Creative Research, ambient noise enhances the creative process as well as encourages adoption of new innovations. Which means that listening to ambient noise makes you more likely to be into new stuff and things. Their research has a lot of future applications which you can read about here if you are really into that kind of thing.
For my own use, instead of listening to my dog snore or the fridge hum while I'm writing, I have been putting on Coffitivity, an app for Android, iPhone, iPad and Mac that plays continuous ambient sounds without the actual ambient people. They are always distracting me with their conversations that I eavesdrop on.
Choose from Morning Murmur (coffee house), Lunchtime Lounge (hungry for a sandwich?), and University Undertones (sleeping in a carrel). By the way, it's FREE!