There is a sunrise and a sunset every single day, and they are absolutely free. Don’t miss so many of them. – Jo Walton
FOCUS: Sunset
I realize that just a few days ago I used a photo of the sunset as my ‘photo of the day’, and here I am doing it again. But with sunsets like we’ve been having – can you really blame me?
Beth Poe :: FreeForm 
The last one presents some cool mystery in its imagery.
Thanks, Jeff! The last photo reminds me of the moon with the way the clouds are lit up…