Pondless Backyard Fountain Pond and Waterfall. Even without the fountain, which in Az will grow algae like nobody's business, I think the idea of softening up the patio with a little rock garden with plants mixed in.
Outdoor fireplace, tiered landscaping, and curved path. The raw Copper path lights that will patina over time will look great and unique for years to come. Having the low voltage landscape lighting make these backyard ideas picturesque day and night.