Mood.

Mood rings aren't the only thing that can tell how a person feels with color.

In film color can is used to help portray mood, even so the mood of a character.
On AMC's TV show, "Better call Saul" a Spinoff to the highly successful Breaking Bad. It follows the life of Saul Goodman before and after the events of Breaking Bad. Now in Breaking Bad, Saul Goodman is a criminal lawyer who is known for his Colorful personality, it even shows through his bright wardrobe that Saul was the comic relief for what was other wise a pretty grim show.

Saul Goodman in Breaking Bad.

Saul in contrast to one of his counterparts.

So it'll come to a surprise that in the pilot of Better call Saul we open to a saturated black and white Cinnabon with Saul not feeling too comedic.

Saul isn't a lawyer anymore and we can see that he isn't too enthused with his new job.

And it's told, in my opinion beautifully in the cinematography and color, (or lack of).
The black and white tells us how he feels about this point of his life and its bland. There is no excitement no enthusiasm, just a man getting by.

All in a days work

The scene carries us on to his home, everything still in heavy black and white where he sitting on his recliner with his drink channel surfing. Awhile later he gets up and goes to his closet to get whats reveled to be a video tape. He walks over to his Tv and puts it in the VHS, as he sits back down on his recliner the Tv comes on but the shot doesn't move, it stays on his face.

We can hear that it's an commercial and we find out that it's one of his from his lawyer days. We can hear his voice but we still don't see the Tv itself, and as the Camera pans closer to his face we see slowly see the reflection of the Tv off his glasses.

Reflecting on his past.

It's in color! I loved this when I first saw it. It tells us so much with just a look and a few colors. Saul is reflecting on a better time in his life, when he was happy being a wise cracking lawyer doing what he loved. And by the faint color in his glasses we can tell all of it is now a distant memory.
Just great story telling in my opinion.