First, why do I have this ugly headband? Because I got it from Claire's in a 10/$5 sale as part of a 2-band pack. The other headband in the pack was solid orange, and being a huge Vol fan, I thought I'd get some wear out of that one. So I bought the pack.
Now let's get on to the how-to portion of this post.
Old fabric covered headband
Hot glue gun
Ribbon, similar to width of your headband
Thread & needle
Step 1: Cut one end of the fabric casing and slide it off of the headband. It should look something like this:
Step 5: I found a button that was about the same size as the middle of the flower and thread that matched the ribbon. I suppose you could use thread that matched the button instead. In a stack I sewed the button, petals, and headband together, starting the knot underneath the flower, up through the flower using the original hole, up through the button and back down and around, catching the headband on my way back up. Do this several times to make sure it's secure and tie it off when you're done.