Here are my first pebbles covered with a layer of polymer clay - they have worked quite well.
I was a bit concerned when making them that the clay might crack or bubble, or come away from the pebble, as I had not glued it on. However, after baking, the pc has made a nice smooth, tight fit over the pebbles. I will need to glaze the one with the metal leaf, to protect it, but for the other two, I am deciding whether to leave them as they are or to use a satin or gloss glaze to finish.
Thank you to everyone at Clay-Polymer Yahoo Group for your replies to my request for advice on covering pebbles and other recent polymer clay queries.