I am not really into ring tones for my cell phone and most of the people I know are not either. I guess if lots of people called me and I wanted to id them from the ring tone I might see a need for them.
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A company called Home Phone Tunes has a product called the RingBoxx that connects between your phone and the phone jack in your home or office and plays whatever tune or sound effect you want.
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You can set the RingBoxx to play a specific tune, sound for a specific number, or just set it to play through all the tones in its library. The company also says that you can program the RingBoxx to mute telemarketer calls, though I do not understand how you are supposed to know when a number is a telemarketer. Via Home Phone Tunes