Non-parents can also take note from the design: "Wallpaper is making a surprising comeback, after being seemingly exiled to the '70s and '80s." Nostalgia drips from the walls and chandeliers at all these royal homes, where the name of the game is history over trends. Maybe it's time to turn to antique shops and second-hand furniture stores for that "old world" touch. But in and out of the nursery, if we can learn anything from the Duchess it is that old always looks better with a little bit of new.