The captain and five other memebers of Iran's national football (er, soccer) team wore green armbands during the first half of a game against South Korea in Seoul. Watch the BBC News report:
As they mention in the video, these players are due to return home after the game, coming back to a country that has banned foreign reporters, is killing and beating up protestors and other opponents of the religious regime, and frantically trying to put a stop to the biggest threat to the government since the 1979 revolution. Godspeed to the protestors, I think, and good for the national team players who demonstrated some real bravery.
I'd love to see some MLB players sport a green armband or ribbon. It might not be their country, but it's a universal cause.