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.
DIY Wood Patio Table w/Built in Beer/Wine Cooler. Would also be cute as a craft or office table, you could put supplies in the middle. A pretty dining table with flowers in the middle, etc. Redoing the patio table like this
41 Cheap And Easy Backyard DIYs You Must Do This Summer