Desktopography
Nice selection of high-quality nature themed images meant for usage as desktop wallpapers/backgrounds. All are free for download as a .zip archive file (some files have multiple image sizes for different resolution needs). Lists over 70 wallpapers.
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Desktopography [ http://www.desktopography.net/ ] set off my antivirus package, which reports a) HTML:Iframe-inf and that it blocked access to another domain. Can’t be bothered to go through the pantomime again. Please make sure no one else has to.