I know this won't be as popular as the evil ones, but I think it may prove more of a challenge since we all seem to be soooo good at conjuring evil goodies to do with our would be ninja powers.
Well, I seem to remember Sandaime Hokage using Kage Bunshin on shurikens, so why not on food and feed all the homeless! (on the flip side, this could be very evil if you did this and claimed to be the Lord Jesus Christ in his second coming. Evil and kind of funny....maybe)
If you had the bloodline limit of Shodaime Hokage you could fix all the ruined forests in California from flash fires with his Mokuton techniques.
Or perhaps create rain in a famine area with a Suiton or Fuuton technique.