For the beach house* river rocks in a box + garden hose = clean feet what a great garden idea! Placed in the sun will heat the stones as well. Great way to wash off little feet covered with grass and dirt before coming inside.
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. I could even use something like this under my deck as a rain tarp.