This 24x18-inch patch of grass is one that doesn't require a "Keep Off Lawn!" sign. In fact, the extra-long (and extra durable) artificial blades on this evergreen doormat actually brush shoes clean of dirt and debris that you don't want tracked into the house. Meanwhile, any rainwater, snow, or other precipitation that makes it to your doorstep will drain from it with ease. Water—er, rinse—occasionally to clean and keep this tiny lawn lush. Available on Amazon; $22.97.