Did you see this slide show of a recycled art program? www.ptotoday.com/slideshows/recyclart-green-art-program
It might give you an idea of the types of recycled materials to request.
Also, since you are still in the planning phases could you start a recycled materials drive with in your school now? You could either collect through the classrooms or perhaps have a general bin in your lobby?
Keep us posted on your event!
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