Not feather earrings, but something called a Living Locket.

My wife showed me one of hers a couple days ago, and I said that she could put one of my flies inside it. This isn't a particularly good picture, but you get the idea.

You can buy these lockets in different sizes and shapes and they are relatively inexpensive. I just did an Ebay search and found 1000's of them available for sale. A nice thing about this is that you can easily change the fly whenever you want, and you don't have to cut the hook off to make a fly unfishable in case you later want to fish with it.