Find out how to set your camera to a longer exposure. I thought my crappy little digital camera didn't have the setting, but it did. So just find out, it could be buried in some menu. Anyways, set it to how ever long you want. If its bright out though, longer exposures will just turn out white (more light gets let in). Use a tripod to make everything crystal clear except whatever moves. Experiment. The ones I made up above were done by actually tossing the camera in the air, and using light from lamps, etc.