The basic supplies that you'll need - a bunch of plastic rings, a glue gun and a coordinating fabric that will match your table setting. I'll be using my mom's quilting scraps in just a plain color since my dishes and napkins have plenty of pattern all on their own. When selecting your rings, be sure to check that they fit nicely on your napkins. I'm using rings from gallon milk jugs as they are a bit bigger than those from a water bottle.
You'll need some embellishments for your napkin rings. If you want to make it a quick day of crafting you can simply use some leftover buttons or you can make your own embellishments. I use a method very similar to this video tutorial to make rosettes out of scrap material. So, to get started, cut a strip of your fabric that is about 3/4" wide and about twelve inches long. You may need to adjust the length depending on the circumference of your ring and how closely you wrap your fabric around the ring. Now add a dab of glue to the end of the fabric and attach it to the inside of the ring.
And viola! Now you have a beautiful addition to your holiday (or anytime) table.