Let s See How To..??
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Open up your Google Chrome & click on " Settings " tab (Top Rigth )
Click on " Tools "
Then click on " Extentions "
Now . Click on " Browse the Gallery "
Next step is search " FB Refresh " search Box & hit enter key
Now simply click on " Add To Chrome "
Restart Google Chrome and open Facebook & see the result
You can easily Change Background image...
First upload your favorite image on any free image hosting for example Flicker & copy Image Url
and Click on " Setting " icone
Past your image url & select " Horizontally " or " Vertically " and " Save "
See Video Tutorial