This started off as a neck tie for my office holiday party, but evolved into a Santa hat for my personal Christmas shindig (far more casual). I’m so very pleased with how the fur diffuses the light. Arduino Nano, 15 WS2812b LEDs, a 3.7v battery from one of my quadcoptors and a good, ole fashioned St. Nick chapeau.
Looks great! Reminds me of this video of @Mark_Kriegsman , which makes me smile every single time I watch it. 
https://www.youtube.com/watch?v=hTbdnfgik20