Brick pavers make a simple, handsome border and work well as edging material. They're ideal for a wide border that keeps grass out of the garden, yet allows flowers etc. to spill over without intruding onto the grass.
Growing vegetables from food waste is a great lesson for kids and also makes great science experiments Teach students how to regrow food and pick a food to regrow as a class. Could use a food from a students leftover lunch.