If you've got CPS (china-painting syndrome), you know the quality of your finished product depends entirely on the quality of the materials you use. That's why Kathy Peterson, a recognized china- and glass-painting expert, offers only "the good stuff" -- porcelain blanks from Limoges and Arzberg, natural-hair brushes, paints in every color for any surface, gold paste, banding wheels, books. And you don't have to dig to China to get ideas. Her Web site features an online store, tips from Kathy herself, a list of upcoming seminars and useful links to the wide, wonderful world of this dazzling art form. Break in.