Have you ever painted using salt?
I hadn't . . . and didn't really know what to expect, but this Friday when we did some watercolor paintings this one had salt sprinkles add in; you can see where the small "star-like" white spots are-- those are from salt that dissolved in wet paint. It was a good fit for this picture, of ocean waves.
If you'd like to try painting with salt and watercolors, just remember that the effect doesn't happen instantly . . . it takes awhile to see . . . but after about 10 minutes the salt dots will be evident, and you can brush off any excess salt.