Thin and flat metal headband
Heavy duty glue - 527 of E6000 works best
Toothpicks and a small plastic plate
First I took and squirted some glue onto the plastic plate so that it was easier for me control.
After putting some glue on the toothpick, I ran it along the headband making sure there was a bead thick enough to hold the chain but not so thick as to ooze over the edges.
Once the glue was applied I began placing the cup chain along the headband making sure to center it along the headband. I felt it was best to work in steps so that the glue didn't begin to dry before I got the chain attached.
Once I got to the end of the headband I snipped off the excess with a pair of wire snips.
Voila! Your rhinestone headband is done!
This headband is really prim and girly so I think it would look best with some mussed-up hair and a messy bun. It would kind of balance the look out.