Grasses are a perfect choice for planting landscape rivers. Choose grasses that don't grow straight up, such as a Red Fescue or Festuca rubra, seen here. These grasses wave in the wind, almost looking like water as you walk through the path.
Make a bold statement. This gigantic urn sculpture is an apt choice for an olive grove, as large urns were traditionally used to store olive oil in places like Italy and Turkey. However, I think of this as an urn-inspired sculpture because I doubt even a large number of gladiators led by Russell Crowe could carry this thing around full of olive oil without creating an oily mess.