Eco-Bricks.  The idea here is to set aside all the plastic you’ve bought from Tesco, Makro, Big C, street markets, etc…. stuff the plastic into plastic bottles and ‘Voila’, you have made an eco-brick.  They use these to make buildings (among other things) and save on concrete materials.  AND!  We find a positive use for all this plastic.

Eco-brick Guides