Is it possible, in Word 2010, to change the background colour in the Header/Footert, i.e. the document background is white and header/footer background green?
Here is a way to do so:
Do the same with "Footer".
Note: there might be a better way.
The answer by Mamaxz works, however, when converting the document to a PDF file it can discolor and any gradient graphic will not convert and will leave white or colored space. In that case you can get away with backing a photograph. Or create the gradient panel in powerpoint and save it as a picture, then insert in word.
It may sound like a ridiculous work-around, but it works.