This is very cool and pretty insightful. The Matrix represents itself perfectly, looking very similar to the code itself. Pan's Labyrinth was also close, and Bambi for that matter. Its interesting to see how closely we associate a movie with the colours in it, even if we dont recognize that association.
Yes, loved the Matrix representation myself too. But then again, look at the Kill Bill one. It's not as "yellow" as I associate with the movie (I think the packaging gives me that "yellow feeling"). But then, there is this one lonesome yellow stripe in the moviebarcode for Kill Bill! I thought that captured the movie well on a higher plane (e.g. main character being quite a lone, too).
That was definitely the one that stood out the most to me. It's always one of the first movies that comes to mind when I'm thinking about color in film.
Agreed, though at times "Hero" is borderline heavy-handed with color. However it manages to remain beautiful. One thing I've learned, though, from a set-designer friend, is that nearly every movie is highly attuned to color and lighting.
If you're looking for other films that use color in interesting ways, check out the "Three Colors Trilogy" by Kieslowski.