These infinity mirror ears were made from some scrap acrylic mirrors and addressable LED strips leftover from my infinity mirror heels project.
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.