Url:
http://www.bing.com/HPImageArchive.aspx?format=js&idx=0&n=1&mkt=zh-CN
- n= The no of images u want( u can use Integers) ,
- mkt= Your location (example: en-US)
More
http://stackoverflow.com/questions/10639914/is-there-a-way-to-get-bings-photo-of-the-day