I posted this forum topic looking for ideas back in March, and Goodhart gave me the idea to use electrophotography. It didn't work in the limited timespan I had left in that semester, but I've improved upon the process a bit to generate these.
In the first step, I'll try my best to explain what exactly this is, however, it's going to be too long for an intro.
****OBLIGATORY SAFETY NOTICE****This Instructable involves the use of high voltages, where "high" means in the thousands of volts range. This should go without saying, but if you are not comfortable working with high voltage, you should not be attempting this, as you will most likely end up in a darkroom with only a safelight to see by, holding both leads of a HV power supply in one hand as you fiddle with your subject with the other. If you do something stupid, this amount of power is potentially deadly. I am not responsible for any damage to you or anything else.
Step 1: Now with added what?
As usual, the most succinct definition I can find is on Wikipedia. Essentially, Kirlian photography, or electrophotography, is a technique that creates an image on a light-sensitive medium (sheet film or photo paper) of the corona from an electrically charged object. I don't have any sheet film, so I used photographic paper, which also allows me to use a safelight.
If you simply Google "Kirlian photography," most of the pages are about how it's "taking pictures of auras" or some such nonsense. I will say this plain and simple: that is a load of bull. If they are images of an aura, then apparently quarters have souls. I highly doubt that.
There is depressingly little information out there on electrophotography, and no pictures. The three pages that I found were the aforementioned Wikipedia article, and article from Make magazine (thanks, Goodhart), and this page from Imagesco.com. To my knowledge, this is the only photographic tutorial on the internet-please prove me wrong in the comments if you know somewhere else.
What's in a name? I have been referring to the process as electrophotography, and the result as an electrophotogram. When the word is broken down to it's roots, it has the best description of the actual process. However, the term "electrophotography" is also used to refer to the process in a Xerox copy machine. This is not the same process. I also want to point out that this isn't quite true Kirlian photograhy-that requires much higher voltages than I have at the moment, and uses film, not paper.