Fix circular mirror to backboard (Preferably round allowing enough for fixing the sun rays to it. Fix them either front or back according to choice- or just clip them on all around frame if using washing line pegs............
Do you want to make one?? https://www.hometalk.com/search/posts?filter=sunburst%20mirror
Hi Cheryl, I've always loved the ones made with spoons...https://www.hometalk.com/28409246/fancy-plastic-spoon-mirror
I made one with kebab sticks, and lace bobbins.
Start with a round piece of stiff card or wood, I used a cake board, it needs to be smaller than your mirror. Make sure there is a hole in it or if it's wood fix a hanging plate.
Then take what you are using as the sunburst and arrange around the base. Once you are happy with arrangement, you can stick them down with the appropriate glue. Then put the mirror onto the top with appropriate glue. If you want to spray paint the sunburst, do so before fixing mirror.