Blue language

Language of Blue: The use of blue in familiar phrases can help a designer see how their color of choice might be perceived by others, both the positive and negative aspects.


Good blue

True blue - someone loyal and faithful
Out of the blue - unexpected (could be positive or negative)
Blue ribbon - first rate, top prize
Blueblood - person of noble birth, royalty
Bluestocking - well-read or scholarly woman
Bluebook - register of socially prominent people
The Blues (capitalized) - popular style of music sometimes characterized by melancholy melodies and words
Baby blues - Blue eyes (also see Bad blue words)

Bad blue

Feeling blue - feeling sad or depressed
Blue devils - feelings of depression
The blues (not capitalized) - depression, state of sadness
Blue Monday - feeling sad
Baby blues - post-partum depression
Singing the blues - bemoaning one's circumstances
Blue laws - laws originally intended to enforce certain moral standards
Blue language - profanity
Bluenose - puritanical individual
Into the blue - entering the unknown or escape to parts unknown
Out of the blue - unexpected (could be positive or negative)

Blue Words: These words are synonymous with blue or represent various shades of the color blue.
Sapphire, azure, beryl, cerulean, cobalt, indigo, navy, royal, sky blue, baby blue, robin's egg blue, cyan, cornflower blue, midnight blue, slate, steel blue, Prussian blue
Source: About.com