Source (link to git-repo or to original if based on someone elses unmodified work): https://github.com/sam0hack/Linux-Login-screens/tree/master/bokehEffect
MDM Lock Screen Theme
In photography, bokeh is the aesthetic quality of the blur produced in the out-of-focus parts of an image produced by a lens. Bokeh has been defined as "the way the lens renders out-of-focus points of light".
Enjoy a beautiful color changing Bokeh Effect Login screen