The Random Widget can randomly display one of the widgets added in every page refresh.
Add a New Random Widget
Go to the layout area of the control panel and select "Add new widget", then choose "Random Widget".
Add Widget Title and Description
Widget Description is the administrative title (seen by site administrators only)
Widget Title is the what displays on the site
Add Other Widgets in Collection
Click the drop down list, select the widget to add it in collection, repeat this step to add multiple widgets.
In this example, six "slideshow widgets" ,from "Random_1" to "Random_6" are added in the random widget.
Put Random Widget On The Page
Go Back To The Page
Go back to the page and refresh it to check the effect.
The first image is different, which means the random widget randomly chose a new slideshow widget.