Towards the end of the "Hero" movie we have a flashback story describing the fate of two lovers and swordmasters - Broken Sword and Flying Snow, but each time the story is slightly different and with different color theme (clothes, background colors):
First, the Nameless tells how he played the jealousy card: He describes how Snow cheated Sword with their common friend Sky, and how after Sky's death in fit of jealousy Sword sleeps with his servant and is subsequently killed by Snow, who is then too upset to fight properly and dies from Nameless's hand.
The theme for that story is RED
Second version is told by the Emperor, who doesn't believe in Nameless's lie: in this story Snow dies willingly after first wounding Sword (to prevent him from stopping her from sacrificing herself). Snow and Sword are tender lovers and the theme is BLUE
Third version tells that indeed Snow was willing to sacrifice herself, but her death was faked and that Sword opposes her and Nameless plan of killing the Emperor. This time, their robes and walls in the temple are WHITE
Lastly, in a flashback describing the first, failed attempt to assassinate the Emperor, we can see Snow and Sword dressed in PALE GREEN, the walls of the temple are also replaced with huge curtains in the same color.