Herby,
I used pretty much all of them made in 15 mm - and some plastic ones from an old Wild Bill set, forget the manufacturer's name, that provided some calves. There are Stone Mountain, Minifig, Peter Pig, and Irregular as well - oh, and some rubber Chinese ones I found in a bin at a local hobby shop. For me it's as much about the "model" as it is about the game so I want a cool looking setup.
Thanks for checking it out.