Great ideas! We have had success in posting the student practice graphs. (Some positive competition usually ensues.) You can vary the type of graph each year: One year use a "thermometer" to show cumulative hours, another year use a standard grid, etc. Students respond to goal setting, making their target goal early, etc. Ultimately the student's sense of personal achievement is the motivator, but these motivational activities help the student build discipline and can be a lot of fun as you mentioned.