Damn. I tried the obvious picture-of-the-sky too but it turned out too pants for submitting and now I can't even try again since you beat me to it.

Never mind, it would not really fit the topic anyway. The topic is "Lighting", not "Light". The way I understand the topic, it should be about taking a photo of any subject using a particularly interesting arrangement of illumination and/or shadow. Back to the drawing board it is.