Contemporary Raised Bed
Essentially low retaining walls, raised beds do not need to be as strong or as heavy as larger structures. They can also be more beautifully designed, rather than serving a purely functional purpose. Line beds with heavy-duty plastic (with drainage holes punched in the bottom) to retain soil moisture and avoid leakage and staining.
Although susceptible to knocks and dents, metal lends a contemporary note to raised beds. Pick lighter colored and galvanized metals over darker metals; they conduct less heat and are therefore less likely to scorch plant roots.