The touches of rust create a more natural feel, but would you be brave enough to use metal as the main construction material in your garden?
The rusted steel used as retaining walls here has an almost natural look with its color and texture. The hardness of the material is softened by clever plantings, including a row of purple Berberis against the lower wall that almost picks up the colors of the rust.
Gabions are easy to use, as they are supplied flat packed and then wired together. They will rust in time, but some manufacturers guarantee them for 50 years.
Stainless steel requires more maintenance than galvanized or Cor-Ten steel; it needs regular polishing to keep the surface clean and reflective.
More: Ideas for using Cor-Ten steel in the home and garden