Blue

Recently I'd been thinking about talking about a bad-mood day, and got distracted thinking about colours.
I mean, the customary expression is "feeling blue " , right? But that doesn't click with me.

If depression has a colour, it's the dirty brown-grey of greasy dishwater. It stinks, it drags you down, and you have to reach inside it to pull the plug, and even if you get rid of it it'll leave a dirty film on your hand, and the sink, too.

Blue, by comparison...

The sky on a sunny day is about as clean and open as anything gets, thought the palest blue that is the sky reflected off fresh snow may get close.

There's a grey-blue of faded jeans, comfortable and dependable.

Deep indigo and midnight blue are calm and reassuring.

Ultramarine, deep and vivid... now, that's a well to the heart of world to draw strength from.

Can't say I understand where the blue = sadness association comes from.

How do you feel about blue? Or do you have a particular strong association with any other colour(family) you'd like to share?