When i can't think of anything else to photograph I generally point the camera at myself. I used my SB-800 flash in repeat mode for this effect. A bit overdone but I got out what I needed to. A nice long scream after a hard day. I have seen other photographs using this technique to show motion such as Tiger Woods' swinging a golf club. I like being able to show several moments in time in one photograph. I will probably play around with this some more.