These permeable clay pavers answer the call for more landscaping products that allow rainwater to seep through to the soil. The reduction in stormater runoff results in less pollutions and erosion, and reduces the load on water treatment facilities. The pavers measure 4 inches wide by 8 inches long and come in nine standard colors and two profiles. Cost: .50 cents to .75 cents per paver. Boral Bricls. 800-526-7255.