“The sky over the port was the color of television, tuned to a dead channel.”

In 1984, that meant the gray fuzz of static; in 2007, it mostly means the lurid royal blue that modern TVs automatically substitute when they don’t get a signal. Most cultivars of apple at the grocery are now red and green, rather than bright red. Peppered moths are now peppered again, instead of black (and were once black instead of peppered).

Are there other colors-by-reference that have changed in living memory?