Insect hotel - Sustainable ideas including an explanation of the materials used, which insects they provide a habitat for and why you want that insect. This would be perfect to have as a project to build with a youth program
Rolls of roses: Simply plunge the cuttings into the ground. Before planting cuttings, push the bottom end into a small potato, which keeps the cuttings moist as they develop roots. It sounds crazy, but the row of allotment roses is proof it works.