One movie that seemed to play with color to a fantastic effect is Traffic - http://www.imdb.com/title/tt0181865/
I noticed when it came out that color played a subtle role in setting the mood of each scene and aspect. For instance, near the border towns and where where the "hot zone" of illegal drug traffic occurred, it was more yellow/orange tinted. Then when you head back to the suburbs and see privileged kids doing drugs in their large homes, the color was much more blue and lighting was much softer. I wish that more movies would employ tricks like this without using a "template"...
edit: looked on IMDB and it looks like 3 different films stocks were used:
To achieve a distinctive look for each different vignette in the story, Steven Soderbergh used three different film stocks (and post-production techniques), each with their own color treatment and grain for the print. The "Wakefield" story features a colder, bluer tone to match the sad, depressive emotion. The "Ayala" story is bright, shiny, and saturated in primary colors, especially red, to match the glitzy surface of Helena's life. The "Mexican" story appears grainy, rough, and hot to go with the rugged Mexican landscape and congested cities.
Side-note: Soderbergh's editing is absolutely fantastic and original too (see: The Limey, Out of Sight). Fine, fine film-maker, one of the few to be able to cross from pure art film to Hollywood blockbuster and back again through everything in between with ease. It will be interesting to see where his "retirement" takes him.
edit: looked on IMDB and it looks like 3 different films stocks were used:
To achieve a distinctive look for each different vignette in the story, Steven Soderbergh used three different film stocks (and post-production techniques), each with their own color treatment and grain for the print. The "Wakefield" story features a colder, bluer tone to match the sad, depressive emotion. The "Ayala" story is bright, shiny, and saturated in primary colors, especially red, to match the glitzy surface of Helena's life. The "Mexican" story appears grainy, rough, and hot to go with the rugged Mexican landscape and congested cities.