I don't know why but I have saved a lot of my old cassette tape cases (you know teachers, we save everything). I think most of them are from the listening center tapes because I store my books and tapes in a large ziploc bag and the cases make it too bulgy. A few years ago a colleague and I were trying to come up with a great way to use all of those cases. We thought that they would make great containers for sight word letters, to play "Mix and Fix". Well it took me a few years but I finally got around to making something with them. If you open the case and flip the top around it makes a nice stand. I printed the "Star Words" on to labels and stuck it to the inside of the case. Then I added the letter tiles and now I have little letter cases that the children can use to practice the star words we are learning. The students can dump the letters out and mix and fix them and put them back again.