We are putting a patio at the front of our house between the garage and front door. We want to put a sitting wall at the front of the patio for function and a bit of privacy. We'll leave approx 18" between the wall and sidewalk leading to the front door for plantings. The house has manufactured stone on the front of that I don't think we'll be able to match for the wall. What type of material would look best with the house?