HoloTats are like the temporary tattoos you covered yourself with as a child, except updated for tech-savvy kiddos. The temporary tattoos get applied just like any other. Pick your desired placement and stick it there.
To make a HoloTat come to life you scan the tattoo with any smartphone with the HoloTats app installed free for iphone and android phones. And, the cost of the stickers is only $6.00 for a pack of 10.