Here are a couple of splashscreens I made whilst creating the wallpaper for the Galileo release.
To install copy to /home/USERNAME/.local/share/plasma/look-and-feel/
Not a Galileo splash just one I put together for my current desktop (I like having the same wallpaper on everything) will probably change this one up a bit more later when I get back home to make the logo not go fully opaque. Also did a minor update on all the above ones and tidied up the names a bit removing the dashes.
One with a more transparent logo
(If you want to use it with a different background just replace the file named background under contents/splash/images)
So quickly did up one with a blank background for people like me who may want to change the image for aesthetics as it saves me a lot of time and will allow you to also make your own
(same steps as above just replace the background image if you use a format other than jpg you will also have to edit spash.qml to point to the correct file otherwise just rename)