https://medium.com/@krish.raghuram/change-the-desktop-background-based-on-battery-status-9662b587c786

This story started as a joke. MAK, a good friend of mine, had created these beautiful renderings in Cinema 4D.

He played a joke on Ishaq, into beliving that the desktop background changes to one of the images, based on whether AC adapter is connected or not. Ishaq figured it out after a while, but it was a funny story in our circle.