From Camcorder to DVD with VideoStudio (Editing Phase) in the topic heading "Overlay Tracks" (Currently still under construction) I recalled that some 18 months ago I used a split screen effect with the distort feature and created a representation of the corner of a room.
On one "wall" I projected a video whilst on the other "Wall" I projected a slide show. I think it makes an interesting variation to the normal day to day home movie (for a short clip only of course).
(You can view this video on You Tube)