I had another idea, aside from just making feathers, I could make leaves, too.
Obviously my focus will still be on leather feathers, but if anyone wants a special leaf, I can make those too!
On the left, an oak leaf (about 4.25 inches) made from 4-oz leather, and on the right, a 7-inch great horned owl feather, made from 7-oz leather.
Both of these are available in my Etsy shop:
Oak Leaf: [link]
Great Horned Owl Feather: [link]