You don’t have to actually be using iOS 15 or macOS 12 (“Monterey”) in order to use their wallpapers – in fact, you can download them here and use them right now!
Note: if you’re looking for the very latest iOS and macOS wallpapers, check out this post for the iOS 16 and macOS 13 “Ventura” wallpapers.
There are two versions of the first iOS 15 wallpaper – a regular version and another for “dark” mode. Here’s a .zip file that contains both, or you can download them individually via the following links: iOS 15 wallpaper #1 | iOS 15 wallpaper #1 (dark). Both images are high-resolution, which means they will look great on an iPad or even on your Mac. If you need help figuring out how to set these as wallpapers, we’ve got an easy to follow guide on how to download and set an image as a wallpaper on an iPhone or iPad.
There are a few macOS 12 “Monterey” wallpapers and here’s the first one.
Thanks to Macwelt for providing these images!