we have an area 20' x 15' in our back yard that grass is very patchy to grow and is also a tough spot to mow because it is in a "L" shape around the back door so we are wanting to make it a landscaped area. the problem is the location of our,propane gas lines, sewer lines,and our electric service is all underground and in this area. so wondering what type of walking surface would be eye appealing ,and also easy to remove if we ever need to do work on any of these services. skutzley