Here is the clip from "In The Mood For Love" that I used to demonstrate the importance of colour, lighting and sound. This scene is so powerful. Please try to see the whole film and its sequel "2046" if you can.
Wong Kar-Wai is an amazingly talented director. There is an interesting essay about the film "In The Mood For Love" here!
Here is another example of colour used effectively, this time from the film "Hero" directed by Yimou Zhang.