Make your own macOS Finder icons from any image
Using this script for the Terminal-App.
Download macOS & OS X installers from Mac App Store or softwareupdate
Because I had a hard time finding them: official Apple links to download OS X Mavericks → macOS Monterey
OS X Icon für meinen Games Ordner
Passend zu den Finder Ordner-Icons in Mac OS X Leopard und neuer.