It's good enough to want to use as a desktop background. I could just do the old "right click, save as desktop" thing in my browser, but that would mean visiting the site regularly (and remembering to do so). So what's the alternative for the lazy user?
It turns out that I actually have lots of options. I first tried a piece of software called ZapBing, but that wasn't a great success (mainly as it managed to violate many of the Windows security features added post-Windows XP). The answer to that problem was a nifty tool called John's Background Switcher.
JBS is one of those tools that does just what you want - and then some. Need to create backdrops on the fly from your photos? From Facebook? From Picasa? From Flickr? From any RSS image feed? It's all in there.
The RSS feed tools are what saves the day here. All you need is the feed from the Bing Image Archive, pushed out by Feedburner [RSS feed link]. You can then set the feed as a source in JBS, and, well, Bob's your proverbial...
[For the more technical of you, if you're running Windows 7, you can actually build a RSS-powered desktop theme following these instructions.]
And yes, that does all mean you can get a desktop feed from I Can Haz Cheezeburger.