There is a major Chinese knot button exhibit that is touring China. It most recently was (is?) in Beijing and is moving to Shanghai for the World Expo next month. Follow the link below to see an English video about the exhibit. It looks like the current fashionable style is to make a pictorial quilt with the button frogs, but considering the size of the thing maybe there’s some knotted frogs in there too.
If there’s an exhibition catalog, and someone were to buy one for me, I’d totally pay you back assuming reasonable cost!! 8)