The neighborhood where I live has a section known as "antique row", which gives me lots of opportunities to window shop while out walking the dog. On Sunday I spent a little time browsing beyond the windows and found some wonderful glass buttons that I had to bring home for my button collection.
My camera is having trouble transferring images, so I can't show you the ones I bought. But if you look around etsy there are lots and lots of glass buttons like these...
Vintage Czech Glass Buttons ~ Available at Reduction Nation
Vintage Paper White Buttons~ Available at Atomic Veggie