Transform one of those old windows you swapped for energy-efficient units into a Labor Day–ready patio table. Here, one sash of a double-hung rests on scrap-wood legs about 2 inches square, attached with salvaged door hinges and new brass screws. The wood pieces are unified with a dark stain. This single pane is safety glass, but you can replace a regular window pane with acrylic sheeting cut to fit and secured with a bead of clear silicone caulk. Then just add a clear coat to protect the wood's finish for seasons to come.