My sister Jennifer taught me this and our other sister Letia taught her. My nieces have been making these for I don't know how long- so, yeah, I'm the last to know, but they are new to me. So, here is a mini tutorial.
Get some ugly metal hair clips, some tacky tape, and some ribbon. Target has these rolls in their dollar section. There is enough ribbon to make two barrettes from each color. Gather scrapbooking brads, beads, buttons, and silk flowers.
Roughly measure your hair clip (usually 4 1/2 to 6 inches). Cut ribbon allowing some extra- you can trim off what you don't need later. Cut tacky tape and apply it to the ribbon back.
Hot glue any embellishments on top. All done. Sorry, these last photos are so washed out- just trust me- they turn out CUTE!