Mushrooms come in a myriad of colors and shapes, but they all have spores. Spores are the very small - almost microscopic - dustlike material that a mushroom uses to spread its "seed" or repopulate. If you have ever accidentally kicked a puff ball and seen the cloud of smoke come up from it then you have seen thousands of spores released into the air.
This activity uses those spores to make an imprint of the mushroom and the result is very beautiful. It is an easy project for little hands to do with a little prep help from a grown up.