On the wearable applications subject, you could have the contacts in your pocket, so you could text with your hands in your pockets.
Are you texting, or are you just happy to see me...?
Then you could have a tiny screen embedded in a contact lens---wait, I'm getting a little ahead of our time.
Not really too far ahead:
http://www.bhfo.org/news/press-releases/contact-lens-display-system-2.html
On a side note:
I thought about a display like this a long time ago (back in the heyday of VR in the early 1990s); I obviously wasn't the only one thinking like this. At the time, I thought only hard contact lenses would be possible for the substrate, so its nice to see that it can be done with softer materials. My main problems for some of my ideas is that a) I don't know any investors or others who could help make them happen, and b) I don't have access to the materials or equipment necessary to make a prototype. Its frustrating at times to have interesting ideas that you have no possible way to implement, though you know that if you had the time and money you could implement them (ie, they are not so far off in the future as to be impossible, and the technology exists in some for currently to do it, it just all needs to be brought together into a whole system).
Ah, well...
