I saw this display of earrings at the Merritt Island NWR visitor center and fell in love. They are designed and produced by a small company called Jabebo.
In each pair of earrings, two different images complement each other. I enlarged a few of them below so you can see what I mean. My pictures don't really do these intricate designs justice; you can see them all (including other science-themed sets besides birds) at the Jabebo website. My favorites are the American Robin & nest, Mockingbird (seen below), Osprey (seen below), Saw-whet Owl, and the Northern Flicker (yellow-shafted). I would love to see a Barred Owl in their offering!
The earrings are minature images pressed onto a double layer of post-consumer cereal box cardboard. The display cards are made of the same material. You can read more about the process on the Jabebo website.
The earrings are mostly sold at nature centers and wildlife preserves; you can find out where to buy them in your area here.