Sleek leather band
You can make your own faux leather wrap by purchasing some by the yard at your local craft store or take the easy route and buy one here. Wrap it tightly around the base (secure with an elastic first) & you're done!
Shiny gold ring
You can use any ring you have in your jewelry box, but having tried this myself, I find the stretchy rings to be easiest (especially if you have thicker hair). Just make sure you first secure the ponytail with an elastic before sliding the ring on.
Leave a strand of hair loose at the base of your ponytail. Then, wind it around the elastic & wrap a few more times further down the tail. Secure with pins on the underneath side of the pony so they can't be seen.