For it to just be there, you'd first need to split the table into two using another <td> tag and possibly hide the border line it produces. Then just use a background="image url here" in the new <td> tag you produced and you have a background. Otherwise, you can easily add one but it would apply to the whole table. Except for the ones already having their own <td> tag. (Like the thread options box with show printable version etc.)
Hope I helped.
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