Transparent Calendar Widget lets you see your calendar events on the home screen without opaque backgrounds that blocks your beautiful wallpaper. The colored indicators on each rows tells you what calendar the event comes from.
It currently has the following configuration options:
* Select which calendars to be used when showing events in the widget
* Select colors for each calendar ( that shows up on the left of the row)
On Android 4.2 - 4.4 it's also possible to add the widget to your lock screen. (On 5.0 and later Google removed this functionality from Android)