Many pieces of jewelry like necklaces or bracelets need some kind of closure. Purses do, too, journals perhaps. Maybe you crochet an iPod cozy that should be closable.
You can use pre-made closures (which I mostly don’t like), but you can make a self-made shank button match just as you like.
For my bracelet bracelet *Little Black Dress* with the beaded spiral bead I made such a shank button and it worked out really fine.
Here at unikatissima:
Beaded Spiral Beads