Looking for a weekend project? Try you hand at creating an anthotype, which is an image created using photosensitive material from plants. Grind up some plant matter to harvest the juices, paint the juices onto some paper, place a negative over the paper, and then leave the image out under the sun. When it’s done exposing, scan the image to preserve it and place the print in a dark place, since light will slowly cause the image to disappear. Photojojo has a step-by-step tutorial on the process here.
DIY: Create Photographs Using Plant Matter! [Photojojo]