Wouldn't it be nice to have something like a Polarizer or maybe a warming filter on you because the day looks sorta boring? Well it's entirely possible that you already have what you need right on you:
Just combine your camera with your glasses like the shot above, and you can turn this:
Granted you could have done most of this in Lightroom, but if your shades happen to be Polarized, graduated, or have some other interesting optical qualities, then you have something unique that's not possible to duplicate in software. And that's were it gets interesting. Also, there's no reason you can't do the same trick by putting your glasses in front of your iPhone.
*with a tip of the hat to Chase Jarvis.