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Other photos appear in other graphics. They may or may not have been intended as wallpapers at one point too.
Turns out Microsoft New Zealand had a winter version of that New Zealand Bliss wallpaper, along with a Queen's Birthday 2005 version (haven't found it in desktop res yet). This is a rabbit hole I wasn't expecting to go down.
Still saddens me we'll probably never get high/full res versions of these Windows XP user account pictures - all of these seem to have been taken down from stock photo sites.
Early sketches and renders of Windows 7's img24 wallpaper. (final in bottom right corner)
The 60's USA's wallpaper evolution is interesting - beta versions have overlying symbols added on top of the background, before being removed. The final wallpaper also features stronger colors.