You can easily change the overall colors of the template with just a few clicks. Go to the Design tab and click on Colors. From the list of colors, you can choose a different color scheme. As you hover over the different choices, you can see what the overall feel of the document will change with each different option.
Changed the color and want to go back to the original design? Easy! Just go back to the Design tab and choose the Themes option. From the list, click the option to reset the theme of this template. And just like that, your document color scheme will be restored to its original!