I use Melodyne often on my own vocals. Sometimes I use it to correct pitch and other times for creative strange things. On my song I Stand with You (link) I sent my vocal to my friend Gabri Negro in Italy and he created a few harmonies of my own voice using Melodyne on specific words. He’s a classically trained musician and knew exactly where on the scale to place my “other” self. In the video above you can see Melodyne’s Random Deviation function which speeds up creating variations of original material.
“Simply copy the vocal track, insert slight deviations in pitch and timing, and place the tracks in the stereo image. And with the clever functions of Melodyne, you don’t have to move every note by hand.” – celemony
For more info: celemony.com