Imagine a world with only three colours. No green grass, no purple mountains, no orange sunsets.
But so many of us live our lives in a limited spectrum.  We restrict our experiences to ones that are familiar; we choose our friends from people who have similar backgrounds and beliefs. 
My own family has made some inroads into the crayon box:  a blend of different religions, ethnic backgrounds, and colours.  For us, it's easy being green.