Just a few of the clipart images I found at iClipart.com while looking for Blue:
Blue, Bluer, Bluest, Gloomy, Depressed, Dismal, Dreary, Blues, Down In The Mouth, Downhearted, Low-Spirited, Gloomy, Downcast, Dispirited, Depressed, Grim, Down, Low, Dejected, Frowning Man With The Blues Wearing A Hat With A Raincloud, Blond Woman Walking With Her Head Down Looking Blue, Sad Santa Claus All In Blue

Favorite "Blue" Sayings?
'be in a (blue) funk', 'between the devil and the deep blue sea', 'black and blue', 'blue-blooded', blue-blood', 'blue-collar', 'blue-eyed boy', 'a bolt from the blue', 'the boys in blue', 'into the wild blue yonder', 'like blue blazes', 'once in a blue moon', 'out of the blue', 'talk a blue streak', 'true-blue', 'until you are blue in the face', 'out of a clear blue sky', 'the blues'