GNOME is a popular GUI choice for linux users, here’s a bunch of free linux GNOME wallpapers you can download.
Of course, you don’t need to use to download these, you can also simply use FTP to download to your Mac/Windows computer too.
First you need to create a directory in your home directory, lets call it Wallpapers
Now you need to connect to gnome.org ftp servers
Next you will be asked to enter a username and password. “anonymous” will be your username and just press enter when prompted for the password.
Now lets navigate to the wallpapers on their servers
cd cd /pub/GNOME/teams/art.gnome.org/backgrounds
You will also need to turn prompting off, you don’t want it bugging you asking you if you want to download each single file
Now lets download all 1280×1024 (assuming thats your resolution)