Just one crayon left

There was a box filled with colors, everyday the children would draw and tell untold stories to themselves.  They used the vibrant colors like the yellow, the color of the sun, the blue, the color of the sky, and the green like the fields of grass they painted their canvas with.  There was no need for one color, the only color that still had its sharp point, never used, the grey.  It was a color mixed with black and white, the colors that you can't see if you aren't looking at them just right.  It's color was simply just dull and filled with no life.  Only way it would be used is if someone wanted to color the sky grey for a rainy day.  Why was this crayon even imagined?  What was its use?  It simply was not good enough to be in the box with the other crayons that were put on the shelf.  Maybe one day it will be good enough to use, until then it remained with its blanket of grey paper, sharp point and all.