Source (link to git-repo or to original if based on someone elses unmodified work): https://devel.trisquel.info/teodorescup/kspalsh-theme-placidity/tree/10.2
Placidity KSpash theme with Debian logo.
Tested with KDE Plasma: 5.14.5 .
If downloaded from website, the content of the archive should be extracted either in /usr/share/plasma/look-and-feel or in /home/$USER/.local/share/plasma/look-and-feel/
The source for the background image is https://pxhere.com/ro/photo/1440683