We present Tattio, a fabrication process that draws from current body decoration processes (i.e., jewelry such as metallic temporary tattoos) for the creation of on-skin technology. The fabrication process generates functional components such as Near Field Communication (NFC) tags, while maintaining the aesthetics and user experience of existing metallic temporary tattoos. The fabrication process is low-cost, accessible, and customizable; we seek to enable individuals to design, make, and wear their own skin technology creations.