Windows 8.x:
- It seems most of Windows 8.x's wallpapers aren't stock photos, so that's partially why so few of them are here. 
- The ones that are stock photos are taken from Getty Images.
- img106 from 8 CP/DP lacks some fish and seems to be slightly zoomed in. This version is closer to the original.
- The shell in img104 from 8 (not used in 8.1) is yellow, though the original is blue for some reason. 
- I have included two alternate versions of img5 from 8.1. Alt #1 seems to be the version used in 8.1, albeit slightly zoomed in and recolored.

Windows 10 (not present here):
- Most of 10 RTM's photos were taken by a hired photographer.
- A few of the Technical Preview lock screens are stock photos, though I have not included them for the same reason I haven't included most of 7's wallpapers: they're too close to the originals.