Windows 8.1

For pre-release wallpapers and pictures, see Windows 8.1 Preview.

Windows 8.1 is an operating system released by Microsoft in 2013. TODO: add a little bit more information about 8.1

Wallpapers
While Windows 8.1 reused the Flowers theme from Windows 8, it came with a new default wallpaper 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.

User Account Pictures
Windows 8.1 has only 2 absolutely identical user account pictures, user and guest, used for default accounts and guest account respectively. Both of them were reused from Windows 8.

They have very high (comparing to used in Windows versions before Windows 8) resolution of 448x448px. Also it has .png-formatted versions of both of the pictures and resized versions of the user picture, probably used by Metro applications.

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

Setup background
The setup background called background_cli.bmp used by Windows 8.1 Setup. It was reused from Windows 8. It can be found in the  folder inside of Windows 8.1 ISO. The background itself consists of simply, the default Windows 8 accent color. The same picture used in Windows 8 and 10.

Trivia

 * Windows 8 has a total of 14 wallpapers. It's 1 pictures more than included in Windows 8. Windows 10 has the same amount of wallpapers, and Windows 10 Team has 4 pictures less.