Looking come up with something extra special for their girlfriend, Vishal soni created these LED earrings with a custom PCB. The earrings house 12 Adafruit NeoPixel Nano 2020s and a ATtiny85 microcontroller. See the full guide and details on Hackster.io:
The initial concept was straightforward: a tiny PCB populated with multiple RGB LEDs and a mode-select button to cycle through lighting patterns. However, achieving this in an ultra-compact form factor while maintaining stability, brightness, and runtime quickly became a design challenge.
For a little less work you could also grab a GEMMA and NeoPixel Ring to whip up these Hoop Earrings
