November 02, 2012, 2:23 PM — Here's how you can find the secret, hidden high resolution wallpapers in OS X Mountain Lion.
1. Open the Finder.
2. Hit Command+Shift+G to open Go To Folder.
3. Enter this path:
4. Copy the four folders below to your desktop, Pictures folder or wherever you want to keep them.
5. Right-click your desktop, choose Change Desktop Background.
6. Choose the image you want in those folders to be your desktop wallpaper.
For more, see the original article at the link below.