Imagine the sky a different color.  In fact, split it right down the middle.  To the left the loveliest color in your imaginative arsenal and to the right the most frightening color.  Choose one of these questions to get you rolling along in your writing.  1.  Who would live under such a sky?  2.  What could make the sky look like this?  3.  These are the colors you were expecting to see.  What would seeing pale blue do to your psyche?