What I was looking for is the product called "Magic stamp". Magic stamp is a
foam product that when heated with a heat gun becomes soft. You press it
against something cool with texture, then it can be used as a printing
object. When you are finished, just clean it and re-heat with the gun and it
can be used again and again. (so they say)
They have it in several different shapes, but most interestingly for the
classroom, in a box of 114 pieces at .50 per piece (suggested retail).
They suggest incising drawings on Styrofoam meat trays and then pressing on
the warmed Magic Stamp to mold a positive stamp. The results they show are
quite attractive. I like that students could produce their own original
stamps without using carving tools and only a minimum of materials.
Have any of you used Magic Stamp? did it work?