I used Crystals and Crochet Mandala Madness pattern. https://crystalsandcrochet.com/product/introducing-mandala-madness-cal/
I actually started this project a year and a half ago. It’s been about 95% done for over a year, I finally finished it up this week!
It’s three feet wide. Plywood circle that I painted and I used screws to secure the crochet to the board.
I used I Love This Yarn brand yarn (my favorite)!