This project was inspired by Becky Stern and Lady Ada’s Adafruit Gemma Hoop Earrings and the wonderful folks with the FastLED library.
This instructable will show you how to create a beautiful LED Pendant with one or more LED rings. I like different modes on my wearables so this project incorporates a button as a mode selector.
I’m not going to go over how to add multiple rings to your project, but some pictures will give you a few ideas of the possibilities.”

Link