This entry was published at least two years ago (originally posted on January 17, 2020). Since that time the information may have become outdated or my beliefs may have changed (in general, assume a more open and liberal current viewpoint). A fuller disclaimer is available.
From @J3nRa1n on Twitter:
No one asked for this. But here it is: every macOS wallpaper from Mac OS X 10.0 Cheetah to macOS 10.15 Catalina combined. I highly doubt that anyone will ever use this. But I’ll use it lol
A full 5K resolution version can be downloaded here, along with a few different iOS versions (which don’t work quite as well, IMHO).