Electronic Paper-style Changeable Tattoo

The other day I was thinking about how great it would be if we could get animated, changeable tattoos. I looked online to see if anyone had tried this yet, and to my surprise I found that somebody has. Two people have claimed that by surgically placing a thin, flexible LCD screen under the skin, they can create tattoos that can be changed (or turned off completely) whenever you want. They also install a microprocessor that can be programmed wirelessly, so reprogramming your tattoo can be done quickly and easily. They say they've actually done this to about 60 people. However, awesome as these guys are for finding a way to do this, there are some drawbacks:

1.It's illegal as hell. The technology is untested, and the only people that are doing this aren't surgeons. 2.Short battery life. LCDs have to be backlit, which means they constantly need electricity or they won't show up. The batteries are also placed under the skin, and they need to be recharged every four to twelve hours. 3.It might not actually work. No offense to these guys, but they don't allow pictures to be taken of their changeable tattoos, and I couldn't find anything anywhere online about whether these work well or not. Maybe it doesn't show up very well. Maybe it causes scarring. Who knows.

So this system leaves a bit to be desired. Why not replace the LCD with an electronic paper display, like the Kindle uses?

Electronic paper uses a layer of electrodes, then a layer of tiny capsules full of clear oil and dark particles, and then another transparent layer of electrodes. All of these things can be made to be flexible pretty easily. The electrodes cause the dark particles (titanium dioxide) to move up and down, making the capsule appear dark or light. Each capsule is like a pixel, and once the particles are moved, they stay put, which is why they take so little power. Stick one of these in your arm, and it ought to last for days, as long as you don't change your tattoo too often. You might need to paint the bottom layer of electrodes to match the color of your own skin, to make the tattoo invisible when it's turned off, but otherwise, it should look just like a regular tattoo.

Oh, and don't perform this procedure in a dingy tattoo parlor. You'll need everything to be as sterile as possible or you'll run the risk of skin infections.