Many Android smartphones have a function «screen Saver» (in the past the DayDream), which allows you to set the clock, a colored background and a different image as the Wallpaper. Often it can seem while charging the device or connecting it to a docking station.
Forum member under the nickname Humpie XDA have created an app Widget Screensaver which will display during splash screen any widget that is installed on the device.
In the settings menu you can resize the vertical or horizontal sides of the widget, as well as to enable protection against screen burn-in.
The app works on devices with Android 5.0 and above. Widget Screensaver available for installation in Google Play.