Sci-fi writers have been long suggesting just such things. Digital clock readout under your skin, instead of a watch? Control panel for your house in your inner forearm? Animated ink? Neon glowing tattoos? I'm sure all of this will be available sooner than later, along with surprises we haven't thought of yet. As a purveyor of the regular old kind of tattoo, I look forward to having the option of integrating more layers of tech functionality into the skin.