What is it about kids and clay (especially boys)? That seems to be the most popular center I have (that and painting). Just when I think I've seen it all, I get a surprise.
The boys love to pound the clay. I've had to set some parameters so that I actually get some of the boys to use the time to actually produce something other than a squished ball. So I bought some dowels, cut them to about 18 inches, and have taught the kids how to use them as rollers.