Here is a link to the video tutorial (by Secret Life of a Bio Nerd) on Threadbanger.
Just in case that wasn't clear, it's not my tutorial. I can't find the woman's name, though-only her user name. It's a quick, easy, and fun project---it took me about half an hour.
I made up the earrings on my own. I coiled half a zipper into itself, gluing with hot glue as I rolled it up. I like vintage zippers with the silver teeth the best....I like the little bit of shine.