When I first got on the Internet I loved collecting wav sounds. My favorites were clips from movies, theme songs or sound f/x. I would store hundreds of these things on stacks of 3.5" floppy disks. These days there’s no reason to really collect them yourself when you can find just about anything you want online whenever you want.
The PhoneZoo website provides just that source for you. With their website you’re looking for a new ringer and they have thousands to choose from in your search. The challenge is finding one that won’t truly embarrass you if your phone rings in an inappropriate time showcasing that special ringer you’ve found.