Yellow is a color that is associated with optimism, happiness and joy. It is also a sign of hope. Thus, the significance of the 'yellow ribbon' (remember the song, "Tie a Yellow Ribbon"). In the Philippines, yellow became a prominent symbol of support for the late statesman Benigno Aquino, Jr., a staunch opposition leader who led the fight against the regime of the late dictator, Ferdinand Marcos.
"Yellow wakes me up in the morning. Yellow gets me on the bike everyday. Yellow has taught me the true meaning of sacrifice. Yellow makes me suffer. Yellow is the reason for everything." - Lance Armstrong