How do you persuade people to recycle their Christmas cards at Tesco's and M&S so that the money raised goes to buying more saplings? That was the task The Woodland Trust set mightysmall.

We came up with a very simple idea. Create a poster campaign with an illustration of a stark bare tree and the headline "Turn your cards back into trees". Then add more and more real recycled Christmas cards to the posters (chosen by us after rummaging through the supermarket collection bins) so that over the course of the month the trees blossomed back to life.

So that's exactly what we did,creeping around in the dead of night to add the cards so that  commuters witnessed the magical transformation as more and more cards were "recycled" into trees.

Our Client Jacqui Morris said in the press release: "The campaign designed by mightysmall is extremely powerful.It is an innovative approach to promoting our Christmas card Recycling Campaign".

Nice lady.