Kirlian Photography - photographs which capture the electrical corona put off by living and some inanimate objects, could provide some interesting data in paranormal research. Anyone who has ever done dark room work has played around with 'contact' photo grams and this phenomena. It is not really surprising given the recognized electro-magnetic nature of our world.
The process first introduced in the 1930's has revealed changes in the bio-electrical discharges of plants and humans under controlled experiments. Stimulated plants have been shown to glow brighter and dying plants have been shown to grow dimmer. It has even been used to treat and locate athletic injuries.
Since one of the guiding theories of paranormal ghost hunting is that the entities drain electronic equipment to manifest, it may be possible to devise a means to capture an image based on Kirlian photography. An electrically charged 'flycatcher' approach might identify a space with infused electrical power to attract and enrich the environment and a camera set up to automatically take photos at set intervals.
Surely, if entities are willing to blink lights and use voice boxes, they would be willing to participate in such an experiment. The results might be startling and strangely clear. Which could be good or bad depending on views of the after life.