This was made for my wife and are made from (2) LED rings, and run WLED on a ESP-01 mounted to one of these handy carrier boards. I had to modify the board a little bit to get it to fit into the project case (removed the reset button and 3-pin connector). It is powered with a 18650 cell connected to a single-cell charging board which gives the battery some undervoltage protection and easy micro-usb charging.

I made a set of ears for myself using a full disc of LEDs, but I like the simplicity of this set. Even off, they look classy (well, as classy as a set of mouse ears can get).