The Church of England has an online Advent Calendar, this year with an environmental theme, "Ready, Steady, SLOW" - sorry, but there are no chocolates behind any flaps...
The site encourages you to take time out this Advent to slow down and consider your lifestyle with daily challenges and thoughts. The calendar contains a range of reflections, actions and video clips. Advent Resources from the Church of England.
"We hope for a world in which we have learned to live with the grain of things, to live patiently, to live respectfully, to live in a way that takes our environment seriously..." Dr. Rowan Williams
Ready, Steady Slow