Right Now I still have the stock ringer (Classic phone) but on my old storm I had "On a Boat" by Lonely Island Boys.. yeah, Kind of outdated at this point.
I do like to change ringtone for a each few days such as a week. i always use the songs I like such as Jessie j and katy Perry's songs to be my ringtone. what i use for it is a ringtone maker to help me deal with that.
I really love the default nokia ringtone.. sadly i couldn't get it anywhere except on Nokia phones and i dont use a nokia fone.. but i really love the ringtone..