I've been doing the trick of making key chains into earrings for years! But for those you don't know, it's possible. And actually really easy.
Of course I am nerd so there's no question I would use these great lego Star Wars keychains of C-3PO and Chewbacca. It would of made more logically for the earrings to be C-3PO and R2-D2, but they didn't have R2-D2. But for fashion reasons the gold body of C-3PO goes well with the brown "hairy" form of Chewbacca. So bare with me.
So simple, pictures tell you all you need to know:
Now make like a guttersnipe and - Wear & Share