http://www.pinholeday.org/

get to it!

Buy a piece together kit: http://www.sharan-camera.com/
Make a pinhole lens cap for D/SLR: http://www.camerahacker.com/EOS_Pin-Hole_Lens/index.shtml
Print out plans for a paper camera: http://corbis.readymech.com/en


when you're done, post your results!