I remember seeing this technique ages ago. I had no idea it was the hot trend for hairbows!
Basically, you take the grosgrain ribbon, coil it around a pencil, and bake it in the oven to set the curl. Don't quote me, but I want to say it was about 275 for 20 minutes?
From there, I would snip into sections, hit the ends of the ribbons with Fray Check, gather in the center with wire, then wrap the wire onto the clip. Voila!