Windows 8.1

Windows 8.1 is an operating system released by Microsoft in 2013. For pre-release wallpapers, see Windows 8.1 Preview.

Wallpapers
While Windows 8.1 reused the Flowers theme from 8, it came with a new img0 and replaced the Nature theme with the Lines and colors theme. It is not known where most of the wallpapers from this theme originate from, although one of them is known to be an altered photo from Getty Images. The others could also come from Getty, although reverse search engines regard them as too simplistic to make a match.

Lock Screen Wallpapers
8.1 came with a few built-in lock screen wallpapers, some of which came from Getty Images, while the others were created by Microsoft themselves, including graphic designer Marius Bauer. Most of these were reused from 8.

Picture Password
You can see this image in the Picture Password setup tutorial when setting it for the first time: