If you want to make slides: Use contact paper, a strip 1" x 3" folded in half
can hold all kinds of mixed media from colored cellophane to staples. Of
course you put the matrials on one side then fold the contact paper over and
rub to remove air bubbles. The slide imagery is endless from realistic to very
abstract. You can touch on science too. Also, scratching into acetate with a
nail or compas point will create a black line when projected. Perm. markers
can add color.