We used to have guineafowl, to eat bugs in the yard. We don't anymore, but I still have a shoebox full of feathers collected from them. They're wonderfully polkadotted and barred, and marvelously soft.
I'm doing a swap sponsored by the Ravelry Phatfiber group, and I decided to try sewing a feather fascinator, and that led to dyeing the feathers.