A little bird told me...

...that sewing a pin onto the back of a button makes a broach.
This particular one came from a very small but very full button shop. They have buttons shaped like just about anything you can think of, and then some! Slice of cake? Of course, in which colour? Sewing shears? Why yes, large or small? Button joy!
Or in this case, with the addition of a broach back which Lara very kindly gave me for a different purpose entirely, broach joy!
I probably ought to have glued it, but I had thread not glue, and wanted to wear it now this minute. So I have to live with a slightly messy back. Oh well, nobody would ever have seen it if I hadn't just posted it...