Larry Prescott has been busy writing up his lesson plans and is sharing them
with you. Here is a great one for you to try now - as your supplies are
dwindling. You can use any sorts of media in this non-objective lesson -
that begins with stamp printing lines using cardboard scraps.
These lessons are for middle school - but I see no reason why you couldn't
adapt them to high school - or simplify for elementary. They are linked from
the Middle School Lesson Plan page.