I saw this article on The Verge that I wanted to share http://www.theverge.com/circuitbreaker/2016/8/13/12460542/mit-microsoft-research-gold-leaf-smart-temporary-tattoo

Below is a short video that gives an overview of the technology. It shows a quite sensitive and fairly accurate temporary tattoo that you can apply to your skin to control an interface on a device like your phone or PC. The designs of the tattoo can be as aesthetic as you like, as they are cut out like a stencil.

I think the designs and future potential as wearable tech is really cool. I'd love to see this taken further than just a research proof of concept.