Giant Olympic rings made up of over 20,000 flowers are unveiled at Kew Gardens in London on April 18, 2012 to mark 100 days until the London 2012 Olympic Games. London Olympic organisers stressed the importance of creating a legacy from the Games on April 18 as they started the 100-day countdown by unveiling the event's motto: "Inspire a generation". AFP PHOTO / JUSTIN TALLIS

A picture shows the Olympic countdown clock in Traffalgar Square in Central London on April 18, 2012 showing 100 days to go until the London 2012 Olympic Games. London Olympic organisers stressed the importance of creating a legacy from the Games on April 18 as they started the 100-day countdown by unveiling the event's motto: "Inspire a generation". AFP PHOTO / JUSTIN TALLIS

Giant Olympic Rings, measuring 11m high and 25m wide, are launched on a barge onto the River Thames, in London, on February 28, 2012, as organisers celebrate 150 days to go until the start of the 2012 London Olympics. In the background is London's Tower Bridge. AFP PHOTO/MIGUEL MEDINA

The name "London 2012" is photographed with the Olympic Rings in the background outside the press conference room at the International Olympic Committee (IOC) headquarters on December 10, 2009 in Lausanne. London 2012 will host a mixed doubles tennis event for the first time in the Olympic Games as well as more women's cycling, the IOC announced. AFP PHOTO / FABRICE COFFRINI

Olympic rings are seen on the roof of a hotel in Sestriere where the 2006 Winter Olympic Games take place, 06 February 2006 . The Winter Olympics are running from 10-26 February. AFP PHOTO DDP/JOHANNES SIMON

Swimmers compete in the Modern Pentathlon at the Goudi Olympic Complex during the 2004 Olympic Games in Athens, 26 August 2004. AFP PHOTO OMAR TORRES

The Olympic flag flutters 12 August 2004 at the Markopoulo Olympic Equestrian Centre in Athenson on the eve of the official opening of the 2004 Olympics. AFP PHOTO DDP/JOCHEN LUEBKE

A player serves 11 August 2004 during a tennis training session two days before the start of the 2004 Olympic Games in Athens. AFP PHOTO / Jean-Philippe KSIAZEK

A female spectator wearing glasses made up of the olympic rings laughs during the finish of the men's marathon inside the Olympic Stadium, on 01 October 2000 during the Sydney 2000 Olympic games. Ethiopian Gezahgne Abera won this last competition of the Olympics with a time of 2:10.11. AFP PHOTO/Gabriel BOUYS

Reproduction du logo officiel des jeux olympiques, representant par des anneaux de couleurs differentes les cinq continents de la plancte. Reproduction of the official Olympic games logo representing the five continents with rings of different colors.