BLUE
-Seen in sky and oceans,
but not so much INDOORS, and not so much in movies. that's why they use "blue screen" as background to film an action scene to 'paste' onto another background. like a mid-air fight scene against a blue screen. and later show the scene with a sky scraper as the background.
(that was the change from 'filmed' to 'shown'

-children tend to have crayons in their backpacks!
-and blood is NOT blue! appears blue in veins, its actually purple.
-can be in slacks, as in blue slacks, or an open pen in your pocket,
-BLUE TOOTH (I took a liberty with tooth to teeth

)
-one blue plus one blue = many BLUES, a type of music genre!!
-and if youre sick, you may look blue!!