Today's installment in my Mad Dash to a Stash for retirement includes milk fiber and banana fiber. The milk fiber is very soft, but I'm not certain it's going to draft very easily on its own; the banana seems even less draftable on its own. I think they would do better combined with another fiber.
But I'm anxious to give them at try, and see how they feel!
(Fibers from Dyeing for Color)