Sometimes people associate the color blue with being sad.
I disagree
Blue is one of those wonderful colors. You can use it to express sadness but its beauty is so brilliant I wonder sometimes how it ever began to be sad.
Blue is the color of the sky, when the sun is up there setting it on fire and the sky just reflects this wash of blue, a protection and canvas.
Blue is the color of the ocean just sitting out there, all that water full of life but from where we are it's only blue, or the lake up in the mountains that sits like a mirror, showing you the endless blue of the magnificent sky and you stare into it and get lost in eternity.
Blue is the color of a baby's eyes, or your sister's eyes, or the eyes of that boy, or the eyes of your friend, or the first thing you see when you look at someone's picture. You can get lost in those too, you know.
Blue is the color that mixes with red to make purple or with yellow to make green. It compliments orange.
Blue is one of those colors that you don't see, but you would notice if it were gone. It sits behind everything, making those bigger, important-er colors stand out, but without blue, they wouldn't be anything.
see: pictures