Ringtones didn't cost anything to anyone with 5 minutes which is all the time it took to take an MP3 and copy it to your phone. Songs getting tiresome isn't a problem when you can change it every week, but there's also no reason to limit yourself to songs either. Any sound or bit of audio can be saved as or converted to an MP3 and made into a ringtone. Personally, I'm fond sounds or BGM from video games and sound effects from old cartoons.