Now here is another tricks about using your any picture in Facebook chat box.
Firstly open this in new window http://smileychatcodes.com/facebook-smiley-chat-codes/
Now browse any picture from your computer.
Then select and upload your picture.
Now it takes few secs then your picture will convert into chat codes.
Now copy codes show in box.
Then paste copy code into chat box.and you have done.