The Astronomy Picture of the Day site routinely posts striking photos of nebulae, galaxies, etcetera.
But this recent photo of the New Horizons launch to Pluto is especially outstanding. The photographer,Ben Cooper, not only had to work with a changing, dynamic scene, but frame those changing elements into a well-composed photo. Kudos.
This would make a wonderful poster. Or it may end up as the default wallpaper on my monitor.