Pony-O's are great for older girls who have outgrown hair bows. I use elastic ponytail holders (without the metal clasp) and hand stitch it to the ribbon. I typically use 6 different ribbons in various sizes, and can create any color combination you choose.
Here is an example of a Pony-O made to match a little girl's soccer uniform.
Here are some more examples of other Pony-O's made for a craft show:
