Projects definitely! How about
1) composting
2) build a recumbent bike
3) build a small wind turbine
4) build a concentrating solar water preheater
5) vermicompost
6) develop a tank based grey water marsh
7) Do an energy audit of the school

build an electric go-cart
9) build ancient technologies (trebuchet, walking crane etc)
10) partner with community groups to run community gardens
11) develop community eco walks, eg marsh boardwalks, desert trails, forest gardens whatever is appropriate for your region
12) Run a contest for self made alternate energy
13) Science fair for community sustainability
etc