I was thinking maybe multiple exposure or something. There's stuff online for how to create the effect in Gimp- >Possible resource. I think with film, it might depend on how long you keep the shutter open and have the model move during the process. I'm not really camera savy- only have taken one film photography class, so I'm still stuck on the basics. sweatdrop Hope that helps slightly, though.
sweatdrop I forgot what this is actually called (flash burst maybe?), but what it is, is you leave your shutter open and pop your flash a couple of times. Almost all newer speedlights have a setting on them that will let you do this.