The sky has been an inspiration for me since before I realized how I looked at it. It has something... heavenly to it, I guess, though I don't mean literally.
Once, I was looking through the photos I took with my phone and I noticed most of them were of the sky. Interesting clouds. A single ray of sun circling around or piercing through a white cloud. A sunset when the sun looked like it had dissolved in the sky and turned it orange, like an effervescent pill in water. Storm clouds on a gray sky. Sky, sky, sky.
I just find it beautiful. It has so many colors and triggers such a wide range of emotions.