Nicer than a shade sail over the pool? This is a good summer shade idea. Clip on in the summer, clip off in winter or bad weather. Could run between two permanent shade structures, or between two parts of the house.
Dog Pond - Place a plastic kiddie pool in the ground. It'd be easy to clean and looks nicer than having it above ground. Big dogs can't chew it up or drag it around. This is obviously more fancy than a plastic kiddie pool underground, good idea thou