This is a remix of the great headpiece model by youngs66! I wanted to make the crystal in the center light up, so I added some flat recesses to the back for mounting the electronics. For this project, you will need to print the headpiece in two halves, and I've only posted the file I modified here, which is just the back piece. Hop over to the original thing to grab the front piece (head_a.stl): https://www.thingiverse.com/thing:202589 Then, print both pieces, glue together, add the electronics, then paint.
My headpiece uses an Adafruit Trinket M0, one NeoPixel, and a 2x coin cell battery pack. The bird on the front of the headpiece is painted with Bare Conductive paint and connected to a capacitive touch pin on the Trinket. When you touch the bird, the crystal lights up! The conductive paint still works under a thin top layer of paint, so I covered the front of mine with gold spray paint.
Bare Conductive asked me to write this up as a tutorial on their website, so you can find detailed build instructions there. I'll post a link to that when it's live.