Downspout runoff can cause flooding around the foundation of your house and lead to foundation damage and wood rot. These common problems can be prevented and fixed with a NDS catch basin set under the downspout to catch the water and divert it away from the foundation of your home. Check it out here! http://www.ndspro.com/drainage-systems/catch-basins-and-grates/catch-basins-and-grates-category-overview
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.
Patio pavers can be so expensive. These cheap concrete pavers can be painted any color and laid in any pattern. This is definitely how I want to do our patio!! Just need to decide what colors to use- probably grays and blues with touches of brown to match the slate screened porch.