I took out a few stamp pads and the leftover ends of some chopped peppers from our dinner salad the other night and made these pepper prints for fun. (One of the peppers when printed looked remarkably like a pansy!)
The Italian designer Bruno Munari published a little book called Roses in the Salad dedicated to this technique of turning chopped vegetables into stamps:
Here are some pages:
The whole Munari “Workshop” series is wonderful — check out also Drawing a Tree, Drawing The Sun, and The Tactile Workshops. (There are two others in the series, but the English editions are out-of-print: A Flower with Love and Original Xerographies.) Anything of Munari’s you can get your hands on is worth it…