As an elementary music teacher, I want all of my students to be proud of their musical abilities. I present them with quarter sheet certificates when I catch them doing a good job!
I print these certificates on the school photocopier, using colored paper, cut the sheets on the paper cutter, and place a sticker on the lower left hand corner. If you want to save money, you can even use the photo part of free address labels sent to your house by cutting off your address. I do that and my students love it.
These certificates are not only a big hit with my students but also with their parents! Remember: Parents want to know you care about their child.