Low-maintenance rubber mulch, made from recycled tires, comes in a variety of vivid and natural colors. Because it doesn't bio-degrade, it doesn't need to be replaced after its initial application. And because it's not porous, a 1 1/2-inch deep layer is sufficient. Rubber is heavier than wood, so it's less likely to blow or wash away—a plus in wind-swept areas or on slopes.
1. Rubberific Mulch, from Rubberific of Texas, $10.95 per 16 lb. bag.
2 & 3. Arnold Palmer Rubber Mulch, from The Home Depot, $10.99 per bag (2 cu. ft.).