Well I'm a beginner DROID user. An X blackberry guy. My nic is from my past drag racing days i raced a alteted but is also because I like modding stuff. Anyway enough about me.
You might check out the app "ringdroid" in the Google Play Store...it will allow you to create a ringtone from any audio (mp3) file on your phone...the other possibility is Zedge (also in the Play Store) as you can download ringtones from there....good luck!