Rethink common home improvement store items into cheap but cool garden design ideas. Inspired by the glyphs on Mayan temples, I made cardboard templates to spray paint ancient symbols onto ordinary $2 stepping stones. It can be done in more potent colors with virtually any tribal design. The little towers are made out of square concrete slump blocks designed for constructing columns. We stacked them, pounded scrap pipe down opposing inner corners and deep into the soil to stabilize. The interior cell was packed with gravel for drainage. The top twelve inches was filled with potting soil to support the golden barrel cactus on top. Planting towers wit no concrete, no mortar.