WOOO! I can totally answer this !
I have an iphone and my ringtone at the moment is
"You can swallow, you can spit, you can throw it up, or choke on it! You can dream.. so dream outloud. You know
that your time is coming round! So dont let the bastards grind you down"
LOL how cheery eh? I change it like everyday though by using
http://audiko.net/Its totally free! you just upload a song.. either from itunes or w.e.. or you can just put in the url
and snip out the part that you want as your ringtone. You can choose how long you want it to be and what part.. everything!
Its so easy and really cool! Hope I helped!!!
-Tyra