I have to admit, I find these recycled tire planters charming. Planting containers made from tires are pretty easy to make and cost almost nothing. Since it costs to dispose of tires, getting a few used wheels from a local auto shop should be a snap.
"Only when the last tree has died and the last river been poisoned and the last fish been caught will we realize we cannot eat money." - Cree Proverb This would be good to show students how the Native Americans viewed the value of the land.
RUMI: "Do you know what you are? You are a manuscript of a divine letter. You are a mirror reflecting a noble face. This universe is not outside of you. Look inside yourself; everything that you want, you are already that.