All I wanted was a black background for my phone. I snapped a picture while covering the lens with my hand but forgot to turn the flash off.
Turned out pretty cool, though, so I experimented with different parts of my body for different effects (armpit, forehead, etc.) All images are unedited. I think the different colors are generated from the density of blood vessels, but don’t ask me, I’m no scientist.
made with iPhone 4s for phonearts
and then I made them into an animated gif: