Blue is the only color which maintains its own character in all its tones... it will always stay blue.
There is no abstract art. You must always start with something. Afterward you can remove all traces of reality.
Blue is the color of peace. Water is blue. I like the color blue because it just puts me at peace. The patriotic symbol is blue. I just like blue.
It's a sort of mental transfer: I'm feeling blue so I'll dress in blue. Psychologists might call it 'color therapy'.