LiveScience: Strange! Humans Glow in Visible Light
We give off photons. Which, if you have a sensitive-enough camera, can show what parts of you are glowing the most or least. Which, if enough studies are performed, could potentially indicate to you what parts of your body are having a rough time, healthwise. Which, depending on your imaging software and the quality of your display, could be a beautiful work of art on your living room wall. Which, depending on how often you update it and what sort of lesions you secretly have, could potentially be a damning piece of evidence to anyone who visits your home, especially if it's a full-body image.
"Thanks, a glass of wine would be wonderful. I love what you've done with this space and HOLY MONKEY TRUMPETS HOW LONG HAVE YOU HAD ATHLETE'S FOOT, RHEUMATOID ARTHRITIS, BELLYBUTTON LINT, AND HERPES?"
Don't you love how I jump to the best possible uses of technology?
TV shows like CSI:NY could have a field day with this, in much the same way they've already had a field day with DNA portraits.