You can fashion earrings for your daughter and granddaughter without starting another run on feathers. The findings (earring parts) are easily found at Michaels Crafts. They're fairly self explanatory. Let them pick from the feathers you don't usually use (), bundle them with your tying thread, clamp the finding part around the quill end, and wear 'em! You don't have to go near as far as tying flies to suspend from the loops although that would be really fun .. if they are in to flyfishing. Try not to have them use the really long feathers, as they get caught in stuff (hair, collars, jewelry).
And, yes. I have made many pairs of earrings WITH my granddaughter. It's a fantastic way to spend an afternoon. Even if it will look like a bird blew up on the floor of your tying room when you finish! Take pictures. It's a memory you'll want to revisit.