Just like other operating systems, now you can use a screensaver in your WordPress site too. WP Screensaver, a WordPress plugin by Satish Kumar Sharma allows you to use screensavers in your website when there is no activity for some time.
It shows you a screensaver on your website when it is left idle i.e. with no activity for some time. It have 5 screensavers that can choosen to something funny for your visitors when they leave their screen for a long time.
Start by installing and activating WP Screensaver plugin in WordPress
Upon activation visit your admin area dashboard Settings -> Screen Saver Style Option Page and type in the waiting time for the screensaver.
Your next step is to select a screensaver from the dropdown menu.
If you are going with image background or 3D cube screensaver then you can upload and use custom images inside it.