I used pcb-rnd to design a Printed Circuit Board (PCB) with a “geographical” shape, the shape of the state of Florida, for a Christmas present of six assembled devices for my brother who lives in Ocala Florida and is an avid geocacher. His geocache handle is marked on the board (obscured in video for his privacy) as is a space to write a tracking number. The LED at the “OCALA” logo will flash every 30 seconds. These electronic circuits are “trackables” that he will deposit in a geocache with the idea that it will be moved along. However, trackables are often kept by the finder as a souvenir.
FYI – pcb-rnd is an Open Source printed circuit design software project. It is under very active development with new features being added every week. It is available for Linux desktop (various distributions, from source), official packages in Debian, Ubuntu,Fedora and Mageia, Arch Linux (user package), Mac OS X , IRIX 5.3 ,OpenBSD and (Likely: any 90’s UNIX system with motif). If interested,check it out at: http://repo.hu/projects/pcb-rnd/
Video showing the electronic geocoin