Howtogeek posted a guide about personalize your OneNote 2010 notebook
OneNote is a great tool for saving and organizing your notes and information, but it can be drab looking at plain white notes all day. Here's how you can customize your notebooks backgrounds in OneNote 2010.Personalize Your OneNote 2010 Notebooks With Backgrounds and More
By default, all of your new notes in OneNote will have a plain white background. This can get boring after a while, so if you?d like to add some variety, click the View tab, then click the Page Color button and select from one of the available colors. These all look like standard Sticky Note or legal pad colors, so look very nice for a notebook background.