One of the last themes that we implemented at our school focused on recycling. In hindsight, we could have incorporated shadow activities for a fun, interactive way to engage them. For example, if we projected an image of a clean, green-friendly urban environment and asked the children to trace the buildings and add additional images to their drawing, we could expect a much different picture from the children tracing and elaborating on a traced image of an environmentally troubled urban area.
I think it would be good for the kids, but it would also be a great opportunity for the teachers to see how kids of different ages and developmental levels think about their environment and how that differentiates from their perception of polluted areas.