Here is an idea for a vertical garden in a classroom (plus a fish tank). This could also work in other places -- homes, places of worship, community centres, etc. Maybe even outdoors? With a mesh covering over the fish tank, the cats couldn't get in.
Wall Gardening With mesh and wiring. Wall gardens are a perfect solution for minimal space like patios and tiny backyards. The living walls offers salad fixings along with a creative, eye-catching conversation piece.