When I dream about Hurricane Katrina (and I still do), it always starts with the refrigerators. Kenmore, GE, Whirlpool, Frigidaire, Amana. Hundreds of thousands of these abandoned appliances stood duct-taped shut on the curbs and yards of homes throughout New Orleans. Many were spray-painted with whimsical or forbidding messages. “Funky. Not in a good way.” “Free Beer and Maggots.” “Smells …