So this may be the best cat-lovers invention ever. Abetusk , a user on the website intructables, has created neurowear-inspired, brain powered cat ears with preset motion settings that move with the user's mind . You can learn how to make them here !
I wanted to build something that wasn't too expensive and was easy enough to be done in a sitting or two. I picked out some cheap servo motors, some craft supplies, spent a weekend or two developing code to control the servo's from a microcontroller and after much trial and error, I built some kitty ears that I think are pretty decent.