Solar print paper is so much fun!
"Place an object on the Sunprint Paper and dry it in the sun no longer
than half an hour. When the paper is exposed to light, it goes through
a chemical change. Now soak the Sunprint Paper in water to save the
print, then dry again and enjoy what appears! In fact, you can place a
fern, flower, animal or any other objects on our paper and turn them
into long-lasting images."
The 4x4 kit is $4.95 at Innovatoys