I came across this interesting site and relived good old memories of clay modelling in childhood. My mom used to find all sorts of plastic clay (mostly green, red and blue) and I used to make chairs and see-saws :). I won the clay-modelling prize in third standard (I still have the certificate if you don’t believe me :P ).
I am not sure, if kids still engage in clay-modelling. But it was sure good fun twirling the remaining pieces into a gooey snake and squashing that with my fat square palm!