I'd like to start using some sort of sand tray for literacy for my students in small group to practice sight words. I'm not really sure what to use though. I need something that is small enough that each child could have one in front of them, but big enough to write a word on. Also, needs to be able to be stored and kept clean. My fear is colored sand everywhere!! Anyone have any creative ideas? I know cookie sheets would work....but how to store them? Thanks!