If you take a wide angle lens and turn it backwards onto your camera, then it will magnify the picture. This is about 2 times life size.
I just held the lens against the camera for this shot, but later bought the adapter to mount the lens. Also, if you do this your focus range only goes from about 1-2 inches. (Nikon D80 and Tamron 28-85mm f2.8 lens)