These infinity mirror ears were made from some scrap acrylic mirrors and addressable LED strips leftover from my infinity mirror heels project.
Hardware:
SparkFun LilyPad Simple Power
Adafruit Trinket M0
SparkFun Lithium Ion Battery - 400mAh
Adafruit Silicone Cover Stranded-Core Wire - 2m 30AWG Black
Adafruit Mini Skinny NeoPixel Digital RGB LED Strip - 60 LED/m - BLACK
I built this project on a cat ears headband bought at my local mall. I traced the inside of the ear shapes, then scanned into my computer and outlined using Adobe Illustrator. This file was used to laser cut a front mirror out of one-way mirrored acrylic inset in a black acrylic frame and a standard mirrored acrylic piece for the back.