Is there a way to make quick-release drop earrings? In other words, can I buy one pair of earring findings and have a quick way of switching out one drop for another? Kind of like when you buy a watch face with several different colors/styles of bands?
Lobster claw clasps are a fantastic way to create interchangeable jewelry. They come in several styles, metal types and sizes. Choose one that goes well with the style of your design. Springring clasps also work very well for this type of design.
Check out the article "Transformable Jewelry" and interchangeable/convertible design inspirations listed in the resources below.