Source: http://feeds.gawker.com/~r/lifehacker/full/~3/xy-PlgWvx5E/take-pinhole-pics-with-your-digital-camera
For your digital version of the pinhole camera, you'll need some black paper, aluminum foil, a rubber band, and tape. Ah right, and the digital camera. From there, the essence of the pinhole camera remains the same. You block out all the light around your camera, make a pinhole, and then set your camera to an ultra-long exposure. It may seem silly to turn your digital camera into a pinhole camera, considering that it already is a camera, but it's a fun project. If you give it a try, be sure to read through the comments for a few helpful tips on optimal pinhole size.