Recently a new series of low power ARM processors by ST came out - the STM32F0x1 series. I wanted to try out the controllers so I decided to do a small christmas project and build an LED christmas tree.
The tree is supposed to be quite small so you can hang it to your real christmas tree.
Check out the github repository for the project for more the PCB design files and the code.
Should be considered for the next version (aka next christmas):