WPS Office provides you with a free service through which you can change your Word theme color and spreadsheet theme color. As you continue to type, the new text will appear in the preview on the right. To change the text, expand the Site Identity group of settings. You can edit your site's name and tagline on the theme customization page to see how it will appear right away on your live website. But it is a matter of great regret that Office 2013 has only three window theme colors: white, gray, and dark gray. You can instantly change the look and feel of a complete document or presentation by using a set of fonts, colors, and graphic effects in a theme file.