If you want to add a background color to a document in Microsoft Word 2007, there are a few different ways to go about it. The easiest way is to use the Formatting toolbar. To do this, open the Formatting toolbar by clicking the Tools menu and selecting Formatting. Then, click the Background button and select one of the available colors. If you don’t want to use the Formatting toolbar, you can also use the Quick Access Toolbar. To do this, open the Quick Access Toolbar by clicking on the View tab and selecting Quick Access Toolbar. Then, click on the Colors button and select one of the available colors. Finally, you can also change the background color of a document using Windows Explorer. First, open Windows Explorer by clicking on Start and typing explorer in the search box. Then, double-click on your Documents folder to open it. Next, right-click on any document and select Properties from the menu that appears. In the Properties window that opens, click on the Background tab and select one of the available colors. ..


Open your word document and choose Page Layout on the Ribbon, then select page color to select the background color you want. 

The nice thing about Word 2007 is you just need to hover the mouse over each color to see a preview of how it will look in the document.  Select the background color you want and you are done.