First thing, open a word document and click on the Microsoft Office logo in the top left ..
..followed by Word Options button on the bottom of the menu..
Under the Popular tab, click on the color scheme you prefer from the drop down menu.
You will see that you have a choice of three options to choose from, Blue, Black and Silver. Select any one that you wish to from the drop down box and click OK. There you go, your theme is installed and it completely changes the way your office looks! From here, the theme will change throughout every program in the Microsoft Office 2007 suite.
I personally liked the black one. It gives a very sleek look. You can select one of your choice. The colors as they would look are illustrated below.