If your mac is running catalina, see this article about how you can change login screen.
10+ Mac Os X Desktop Background Keeps Changing
Gif. It is fine to do that on your own machine, or even to make it easy for others to set the background. However, do not write it as part of an application.
Automatically Change and Enhance Desktop Background ... from i.ytimg.com
Now we will show you how to change the login background on macos catalina and macos mojave. Change the desktop background colour. 12 mac os x dock tricks.
Some people even like to move launch system preferences from the dock or by clicking the button on the top left of your screen.
If your mac is running catalina, see this article about how you can change login screen. I changed my background (wallpaper) to a photo a few weeks ago. It's another great way to customise a mac. Depending on your mac os version, you may be able to choose a dynamic desktop image.
