MaryMac, I was at the same workshop as you. I bought a set of bones and stained them there. Percy Danforth was incredible - could play with both hands...different things with both hands. I bought a set of high-tech bones from a guy in Delaware (although I think he was from Maryland) who had learned from Percy.

Bones began in Appalachia, I believe, and are used these days in the US, often for dance accompaniment, sometimes for songs.

Limberjack here. They're very easy to play, but there's a possibility of becoming a viruoso. I've seen people make the little guy stand on his head and play, play on hands and knees, and get the left and right sides of his body going in opposite directions.
Andy's Front Hall - Bones and limberjacks for sale.
Video of Percy Danforth from Mel Bay available here.