Natural pool with waterfall to promote water flow through plants. And I think i would add hidden fencing or chicken wire to make a koi pond inside the planted area. The koi are cool, but the also add the nitrates to the water to feed the plants!
The rock gardens can are available in various shapes and sizes. These ornamental rocks and stones can be used throughout your yard for a variety of purposes that range from a decorative irrigation system, elegant fountains, or ornate gardens.