Using PowerPoint Themes
With Microsoft Office PowerPoint 2007, you can easily change the look of your entire presentation with just one click. By applying a theme, you can be confident that your entire presentation has a professional look.
1. Go to the Design tab.
2. Pause on different themes in the Themes gallery to see a preview of how the presentation looks with the theme applied.
3. Click the theme that you want to apply to your presentation.