This is my first badge and it lights a lot!
It consists of 108 orange LEDs and 8 RGB LEDs on “face," run from one Li-Po and can charge via microUSB. The brain of badge is an STM32F103C8T6 and at this stage have ~10 modes of lighting. It can switch between modes (also can change speed of modes) via capacitive touch buttons, also can show voltage of Li-Po in procent of lighted orange LEDs.
I made SCH in Eagle, modeled PCB shape in Fusion360 and also make simple case for Li-Po which can be fixed on back side of PCB.
All software and hardware parts for making this badge for yourself you can find on GitHub page.
P.S. I was very fascinated by the idea of creating "live" badges, and by creating this (fairly cheap) badge, I often began to think about new ideas for interactive interaction with human through badge, of engaging in a "game" with a badge, this requires much more experience and time to work, but it is very interesting.