Do ya'll know that there are three UI themes in Office 2007. Well! this is only for the applications which has the Ribbon User Interface. That includes Word, Excel, PowerPoint etc. Default theme is a light blue which I think is a dull color. Other two themes are Silver and Black. I think the black one is the best and it rocks.

Click on the Office Button on the top left corner and Select the Options button at the bottom of the menu. This will open up the Options dialog box. Under the Popular Tab you'll find an option called Color scheme and there is a drop down in front. just select the scheme you want and hit OK. This will change the color scheme of your Ribbon UI.

More stuff later ...