A user asked where I got the "Hello" wallpaper in my setup post, and I actually made it myself. Wanted to share the download link with everyone here in case they also
iMac 2021: Bunter Wallpaper für Mac, iPad und iPhone | Mac Life
Download Apple iMac 2021 Wallpapers in 5K resolution
New iMac color matching wallpapers for iPhone, iPad, and desktop