I woke in the middle of the night with another idea not worth patenting, and I’m too lazy to do it, so any entrepreneur who’s too lazy to think of ideas can have it, unless someone already has.
If you make an app that puts a picture of an eyebrow on a phone screen and moves it according to some input (e.g voice, touch, or networked control by your friends or venue), you could use phones to do fun eyebrowy type things at parties, concerts, night clubs etc. You need two phones or a midi-sized tablet unless your eyes are very close together. The phones have accelerometers that know which way up they are and can therefore balance the eyebrows in the right positions. So you can make lots of funny expression on people’s faces using your phones.
Not a Facebook-level idea you’ll agree, but I can imagine some people doing it at parties, especially if they are all controlled by a single app, so that everyone’s eyebrows make the same expression.
You could do it for the whole eye/eyebrow, but then of course you can’t see the your friends laughing, since you’re holding a screen in front of your eyes.
You could have actual physical eyebrows that attach to the tops of your glasses, also controlled remotely.
You could use e-ink/e-paper and make small patches to stick on the skin that do the same function, or a headband. Since they don’t need much power, you won’t need big batteries.
You could do the same for your nose or mouth, so that you have a digitally modifiable face controlled by your friends.
I’m already bored.