Description of problem:
The default background wallpaper image for Fedora 28 KDE Live is the same as it was in Fedora 27. This does not comply with the release criteria "The default desktop background must be different from that of the last two stable releases.)" for Fedora and thus is a blocker.
Version-Release number of selected component (if applicable):
In the system, I can see the following packages:
Steps to Reproduce:
1. Run the Fedora 28 KDE Live
The desktop wallpaper image is the same as it was in the previous release.
The desktop wallpaper image should be the same as in the Fedora Workstation 28.
The f27-backgrounds-kde has the following dependencies in the system, so it may be advocated that it is needed, but it seems like f28-backgrounds-kde should be also installed at least, or the f27-backgrounds packages should be changed to f28-backgrounds packages. Those packages are built in Koji.
kde-print-manager x86_64 17.12.3-1.fc28 @anaconda 1.7 M
kde-print-manager-libs x86_64 17.12.3-1.fc28 @anaconda 541 k
kde-settings-plasma noarch 27-1.fc28.3 @anaconda 7.0 k
plasma-desktop x86_64 5.12.4-1.fc28 @anaconda 28 M
plasma-integration x86_64 5.12.4-1.fc28 @anaconda 487 k
plasma-lookandfeel-fedora noarch 5.12.4-1.fc28 @anaconda 10 M
plasma-workspace x86_64 5.12.4-1.fc28 @anaconda 19 M
plasma-workspace-libs x86_64 5.12.4-1.fc28 @anaconda 5.8 M
sddm-breeze noarch 5.12.4-1.fc28 @anaconda 414 k
xorg-x11-apps x86_64 7.7-20.fc28 @anaconda 938 k
Proposed as a Blocker for 28-final by Fedora user lruzicka using the blocker tracking app because:
This bug breaks the release criteria for Fedora 28, because the desktop wallpaper image does not differ from the previous ones.
The KDM wallpaper (the login screen) is fine.
It's SDDM, not KDM.
That's odd, thought I'd checked this a while back and it was right. But looking at openQA for today, indeed, the KDE desktop background is still the F27 one...
Looks like the package that needs to be updated here is kde-settings, and it *has* been, but not sent to Bodhi:
kde-settings-28.0-2.fc28 has been submitted as an update to Fedora 28. https://bodhi.fedoraproject.org/updates/FEDORA-2018-f9fd8257b0
kde-settings-28.0-2.fc28 has been pushed to the Fedora 28 testing repository. If problems still persist, please make note of it in this bug report.
See https://fedoraproject.org/wiki/QA:Updates_Testing for
instructions on how to install test updates.
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2018-f9fd8257b0
Issue is fixed in kde-settings-28.0-2.fc28 .
Discussed during the 2018-04-16 blocker review meeting: 
The decision to classify this bug as an AcceptedBlocker was made as it violates the following blocker criteria:
"The default desktop background must be different from that of the last two stable releases"
kde-settings-28.0-2.fc28 has been pushed to the Fedora 28 stable repository. If problems still persist, please make note of it in this bug report.