The small dining room in the Winter Palace of Czar Nicholas II and Empress Alexandra, before (left) and after (right) Alexandra's dramatic redecoration in 1894/95.
Formerly known as the "Pompeian Dining Room," Alexandra obliterated the Pompeian ornamentation, gutted the intricate inlaid floors, added Rococo moldings, tapestries, and painted the entire room WHITE. At the time, Empress Alexandra was heavily criticized for her taste and the royal court was horrified that she would stoop so low to purchase her furniture mail order from Maples of London.
Clearly, it was an epic overhaul. Less clear: Was it a mistake?