As you can see, I've changed the header photo, and the description of Mental Blog. An anonymous view...
I couldn't get it to stretch all the way over to the sidebar. I expect there's something in the code that creates a boundary or buffer. Don't know what that might be. Maybe some day when I'm not overcome with angst at the impending doom of the universe, I'll dig into the html and see if I can find the boundary of the Mental Blog galaxy.
The image on the right is the moon, of course. I don't know enough astronomy to tell you if it's waxing or waning. Anyway, it's the moon. A Lunar View of Larry's Head. Larry's Head is this Lunar Landscape. A sliver of light against a dark background. Or perhaps a dark mass with only the barest illumination peeking thru.
On the other hand, when you look at it quickly, it appears to be an Oreo cookie.