LOL! I think anyone who has worked with clay and not discovered C.A.D. yet can't even call themselves a beginner... :)
I found this nice piece of agate-marbled Canadian pottery at a yard sale last weekend, but haven't been able to ID it yet, save it was made by someone with the last name Johnstone in Canada... It's not true agateware in the sense where the clay bodies were actually mixed together to make a marbled body, but agateware in the sense that the redware body was finished with slips and glaze in the leatherhard state.