I have recently acquired a few more:
Two of these came from a charity shop, priced at 75p each. A bargain, in my view!
The third one (the shallow round one) has been rescued from the depths of a cupboard in our spare room, where until recently it was holding some nails (don't ask!).
I believe that simple "props" like these can considerably enhance a photo, so I am always on the lookout for more. I'm sure these ones will be featured again here on my blog before very long, like this maybe...