I like to change the photograph regularly; it's a thing I do, usually around the first of the month. I set it not only on this site, but as my Facebook cover photo, my desktop wallpaper, my phone lockscreen, and even on my Nook. Below is a brief description of why I'm using the photo I'm using.
November is generally a difficult to choose a wallpaper for. Sure, I could go with a fall photo with leaves or whatnot, but those tend to be more distracting than I'd like. Plus, I just did a brown-themed photo in August, so I really don't want something like that again so soon.
I've had this one for a few years but have never used it. It's soothing and icons look nice on top of it on my phone and desktop.