Pinout of the LEDs is as follows:
With that, the tree wiring got relatively easy by bending the LED pins in the four different directions and then connecting all 5 Volt pins with the red wire, GND with the black and chaining data in and out either by directly soldering the pins or via the yellow wire:
The software driving the LEDs is basically the Strandtest one that Adafruit delivers as example for their Neopixel Library. I've modified the code a bit to also show other patterns.
In the future we will add a stand for the tree that will also house the electronics and will also host some additional surprise that I will talk about in a future post :)
[ UPDATE 2016-12-11 ]
I've added a stand and the dedicated TrinketPRO: