This build is a great tiny project to do for the sake of building something semi Christmasy with your Arduino this season.
Arduino UNO/nano/mini/mini pro/mega (or Arduino clone)
1 220Ω resistor
2 RGB common cathode LED
(PCB available in the shop https://www.foureyedjimmy.com/online-store )
Bread Board jumper cables or wire (or PCB board)
That's all folks!! have fun!! and Happy Holidays!!