1 Shot Tattoo Gun

This is just a silly idea for a device that you can strap onto any part of your body, load any image you want into it and with a single "stamp" imprint the exact image permanently into your skin.

The device would take into account personal skin pigment, pixel by pixel to ensure even color and 3-dimensionality. 

Photographic image quality would be literally possible, as would perfect reproductions of real world items. 

The device would probably be very expensive, so you'd still need to go to a Tattoo Artist, but now they are more of a digital artist than flesh-media drawers.

Nano-needles in a very tight grid with individual access to ink-pots and any color combination mixed in real time would make the entire visit and entire tattoo complete in under an hour.

Reversal and REMOVAL of Tattoos would be as easy as selecting the REMOVE ART option, the device would scan the area, find the average skin tone and COVERUP any ink with the background tone, matched 100% perfectly every time.  The result is an instant removal of any tattoo, however old, however deep or colorful it is or once was.