Stepping stones can be a great addition to any space. Installation is a simple process, but you should ensure all stones are set on a level surface and that gaps between stepping stones are filled. Gaps can be filled with a variety of materials such as mulch, gravel, sand, and even plants. Mulch is affordable, easy to spread, and may help keep weeds at a minimum. Gravel is another excellent option but may require more maintenance as weeds can grow between small cracks in the pebbles. Sand is perfect for creating a tight, seamless fit.