Remove the wrapping from several crayons
Mount a sheet of beginning-writer paper on a thin piece of cardboard and trim it to fit a shadow box frame.
Use a pencil to sketch a letter lightly onto the paper and write the teacher's name below the letter with marker.
Cover the letter generously with tacky glue and press on the crayon pieces. Place a book on top of the crayons to hold them in place. Let the glue dry, then place the artwork in the frame.