Desktop icons disappeared

Please refer the following KB article:

http://www.ehow.com/how_6877893_do-icons-reappear-mac-desktop_.html

Also, if nothing works then please check whether the contents of the desktop shows up at the following location:

Home/Users/username/Public/desktop

instead of the following location:

Home/Users/username/Desktop

You can simply copy the contents from  Home/Users/username/Public/desktop to Home/Users/username/Desktop