Take one cork, stack descending size washers of different colored metals to the top and bottom, and screw in an eye screw. They also look great if you simply use a screw on the bottom instead of dangling the bead. Then attach a keychain and you're done. If you want a bit of extra strength glue the washers together.
For Earth day, they utilized a highly renewable resource: Cork. Cork is 100% natural, renewable, recyclable and biodegradable. The fashion and home goods chain transformed the stoppers into artwork on display through April. When the displays are broken down, they'll pass the corks onto Cork ReHarvest where they will be recycled as fishing bobs, brand-new flooring, paper pulp and more.