This is a really cool printing lesson. It may be done with any subject, but for the last 4 years, I have used faces. I think it gives a strong , personal feel to the finished project. Students select a face to draw.I have about 45-50 faces from newspapers& magazines to choose from) Draw just the face onto a 6''x8'' piece of thin paper and tape it to a 6''x8'' piece of styrofoam. Gently go over the lines, remove the paper and go over the lines again. Remind them not to write their name on the front of their styrofoam as it will print backwards.
I have them each print 4 copies, which we then let dry and tape together. Presto--instant Andy Warhol.