Simple Calendar Widget
Android may have its own native calendar widget, but that doesn't mean you have to use it. Simple Calendar Widget provides a serious upgrade from the stock setup, with an info-packed display that can be customized to your heart's content. You control everything from the layout to the color scheme, font color and manner in which events are displayed.
However you configure it, Simple Calendar Widget looks great on a lock screen -- and it's fully scrollable and expandable, too.
The best part? It's a free download in the Google Play Store -- no strings (or ads) attached.