I sometimes sketch out pots before i make them. Last year i fell in love with the Japanese sumi brush and ink technique. I love the line weight and tension you can get out of it. Since line gesture is all i seem to think about these days, this technique is something i would love to get more comfortable with.
Surface treatment, and Decoration on pottery compliments form, and form compliments function, To me these are all connected and equally important. Since decorating with oxides on greenware is not easy, practice is necessary. To me practicing brushstrokes on paper helps me "warm up" before i decorate pots. The more comfortable i get with the brush strokes the better the end results seem to turn out.