Christmas star~ A fun incentive/challenge for the weeks before Christmas: black and white star cutout glued on red card stock, cut out a tad bit larger around. Students color one facet of the star for every time they practice. Give them one focus area per week, split in three steps. When they prove they have worked on the focus area, they earn glitter stickers on the back of the star. In two/three weeks the star will be decorated and will be a personal ornament in their Christmas tree.
Another, simple, holiday practice challenge is to use an Advent calendar.