An Animated Tattoo?

I get the creeps watching this thing crawl up her back....I can feel it. What would a tattoo feel like crawling through your skin any ways? It would be wonderful to be able to animate a tattoo, but I think I will have to wait until people are outfitted with bio-mechanical flesh surfaces, that could be imprinted electronically in layers, like those old fashioned 3D pictures that animate as you move past them.....

I created the animating designs in Adobe AfterEffects, using a popular plugin called Trapcode Particular. I simulated the writhing particle strands first and then mirrored them to create the symmetrical design crawling up the woman's back.