The multichannel campaign, in which the famously multi-coloured sweets are stripped back to white, also won a silver Lion.
The Grand Prix was awarded to 180LA Santa Monica for Boost Mobile's "Boost your voice" experiential campaign, in which mobile phone shops were turned into voting stations.
Grey London won silver and bronze for the Comic Relief "Swear jar". Meanwhile its WPP stablemate Y&R London picked up silver for its last festive work for Marks & Spencer, "Christmas with love", in which Mrs Claus brings joy to a brother and sister.
Google Creative Lab London won a bronze Lion for "Back to life in virtual reality", as did McCann London for Doctors of the World’s alternative Christmas cards "Reality Xmas".
Droga5 London picked up bronze for the Baywatch movie’s "The slow mo marathon" work, while Saatchi & Saatchi London also won bronze for Deutsche Telekom’s "Magenta unleashed".
US agencies that picked up gold included Saatchi & Saatchi New York for Tide’s "Bradshaw stain" (three golds); McCann New York for State Street Global Advisor’s "Fearless girl" (two golds and one silver); as well as Grey New York and Procter & Gamble for Gillette’s "Handle with care" (two golds).