X-Process and 2X-Pose
X marks the Supersampler spot! Load up some slide film, execute your favorite Supersampler technique, and ask the film lab to "cross-process" it - dunking your film in the "wrong" chemicals fires up all the colors in your image! Follow it up with another X-rated trick - the Double-Exposure, that is. Shoot your roll, rewind it very carefully, and reload the film! Doing this allows you to super-impose a stream of images over your used roll. Cool, huh?