I knew there was a reason I have not been throwing those plastic thread spools away. I’ve just used them to make a DIY ring holder.
You will need thread spools (only the base and must be smaller than your ring size), industrial glue, an old jar, fabric/paper.
I leave you with a wish that the DIY ring holder you make is classy and fab. Mine is bordering on tacky. I will probably re-design that one of these days. Perhaps something in all black or when I find a baroque-style wrapping paper in gold and black.