These are coffee mug holders. You can find them at the aforementioned Goodwill store, garage sales, and thrift sales. I always intend to paint them, but then never get around to it. They make perfect displays for jewelry, and I use them at home, but also when I take my jewelry to events to sell. The most I have paid for one, which was the wooden one, was $1.99.
The next little tip is what to do with all those very inexpensive clip-on earrings you can find at junk/antique shops, thrift stores, etc. They make very decorative sweatshirt, coat, or sweater clips. I have shown a few from my collection on a simple sweatshirt, but I have also clipped them to hat brims, hat bands, and head scarves. Think outside the box on these little guys, which are so pretty, and I bet you could come up with dozens of ideas on your own.
It is little things like this that can be fun to play around with, is a good way to recycle which is good for the environment, and it saves you money. A win-win for everyone.