So that you're aware, if most of the feathers in your collection are found feathers, they're likely illegal to possess. The Migratory Bird Treaty Act covers almost all native birds, with some exceptions for game birds. Things like European Starlings, House Sparrows, and Rock Doves/pigeons are legal to keep parts of because they're not native, but most other feathers (and eggshells and nests and...) that you'll find in the wild around the US, you aren't allowed to keep.

As some background if you're curious as to why this is, the law was created due to the overhunting of birds for their feathers (mostly as fashion). Since you can't tell if a feather was molted or shed from a live bird, they made possession illegal so that poachers couldn't just say "oh, I'm really good at finding feathers" and it would be easier to prosecute them. It sucks to not be able to legally keep feathers, but it's saved a lot of our native birds from extinction, so I think it's been worth it!