Prefer Google's search but wish you had Bing's beautiful daily images? With the "Bing wallpaper for Google homepage" Chrome extension, you can set Bing's wallpaper to automatically load on your Google homepage. The extension offers different themes and loading settings.
In the extension options, you can set the background to be the current Bing homepage image or a random one, and it can also pull in Picasa images from a RSS link. Choose to load the new background every time you visit Google.com, only once, or when you load Chrome.
Another nice feature is the option to view the wallpaper image in a new tab when you click the extension button. Then you can right-click and download for your wallpaper collection.
The only issue is that the 960x500 pixel Bing images might look pixelated when you stretch out your Chrome browser too big. Well, that and Google's doodle of the day might not match the Bing background very well.
Still, it's a great alternative to setting your own background for Google.com, because you get a new background every time you want.
Digital Inspiration also notes a similar app for Android, Bing Live Wallpaper.