Fedora 25 Workstation comes built-in with some 18 wallpapers that can be found in the desktop background settings. To access the wallpapers, all you need to do is right-click on the desktop > click ‘Change Background’ and you can select from the built-in wallpapers.
If those aren’t enough, you can still download and install several more official wallpapers. Here is how you can get them.
Install Official Supplemental Wallpapers in Fedora 25 Workstation
STEP 1: Launch ‘Terminal’.
STEP 2: Appropriately apply one of the following commands as per your Fedora desktop environment. If you don’t know what are these, then you should be running the default Fedora 25 GNOME version.
Fedora GNOME users should enter the following command:
sudo dnf install f25-backgrounds-extras-gnome
Fedora KDE users:
sudo dnf install f25-backgrounds-extras-kde
Fedora MATE users:
sudo dnf install f25-backgrounds-extras-mate
Fedora XFCE users:
sudo dnf install f25-backgrounds-extras-xfce
STEP 3: Pay attention to the progress in the ‘Terminal’. You will have to enter root password and ‘y’ when prompted.
STEP 4: After the completion of installation, go to desktop and right-click on the desktop > ‘Change background’.
STEP 5: Click ‘Background’.
STEP 6: You will now see several fresh wallpapers! Select your favorite one and click ‘Select’ to apply it.