cheaper, easier way to add pavers to an existing cement slab, etc... use thicker bricks/pavers for border which will also act as walls for sand layer, then use thin less expensive pavers for the center area held with construction adnesive
Grow seedlings in recycled containers as greenhouses. Any clear plastic container will do. Use paper towel rolls or toilet paper rolls as a pot. When ready to plant, simply place the whole roll in the ground and plant.