Reuse an old tree to make a log pathway in your garden. Good use of "yard" trees and other wood that can't be milled; works much better in climates without termites. Good drainage under the log rounds will make the path last longer.
Designer Jamie Durie framed this outdoor dining room by incorporating a large backyard pine tree into a stone wall. The benches are made of simple fallen tree trunks, an easy, inexpensive way to create gorgeous outdoor seating. - LOVE but trees grow.
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.