Concrete Jungle:A National Schools campaign to create the biggest wildlife garden in the UK
http//www.coolitschools.com/concrete-jungle
I would like to suggest the Concrete Jungle as a resource for schools. It is free, links all the conservation trusts together and the teacher's pack is full of art projects as well as how to make a wildlife garden.
The campaign aim is to create 300,000 sq meters of garden space in schools, to encourage wildlife and connect young people with the natural world. Cool it Schools is a not for profit organization.