I have a lot of RA (Robinson Anton) rayon embroidery thread. It is very pretty. I used to machine embroidery. I have also used to do applique on wall hangings. It is not supposed to hold up as well as polyester threads or cotton threads. I recently made a small wall hanging of a skunk! It was fun, I used a gold rayon thread and an eyelet stitch to make the little eyes. They sparkled! For embroidery, I think the Rayon thread adds a depth of color that the poly threads just don't do. Depending on the stitch position, the color changes slightly making it very pretty. I think it would be fun to do thread painting with it.