[jalb]

Instead of surrounded buy the grey border? Anyone?

[TheWeeBear]

That's the actual sizes of the photo's jalb. You'd need to enlarge them in photoshop if you want them as wallpaper.

Bing Image Archive

There are gadgets and RSS methods that you can use to change your wallpaper every day to what Bing has although I don't know if you'd want to go to all that bother. :)

Get a new desktop wallpaper every day - Windows: The Official Magazine

The Bing Archive includes the HTML 5 videos too if you missed them which is kinda neat. :)

[btbam91]

Running with Weebear's link, it would be awesome to do that with with wp7 lock screen

[tbonecopper#AC]

You can use the Bing Desktop app which will automatically update your wallpaper:

Download: Bing Desktop Beta - Microsoft Download Center - Download Details

Or the RSS powered dynamic theme for Windows 7: Fresh wallpaper, updated automatically - Microsoft Windows