A theme is a combination of one or more slide layouts with coordinating theme colors, a matching background, theme fonts, and theme effects. PowerPoint provides several standard themes. Find a standard theme that you like, and then modify it by changing the theme colors, theme fonts, or the background. You can then save the file as a custom theme. Once you create a custom theme in PowerPoint, you can use it in other Office applications.
Do any of the following:
Step 1. Change theme colors (optional)
On the Theme tab, under Themes, choose a standard theme that you like.
On the Themes tab, under Theme Options, click Colors, and then click the theme color that you want.
Step 2. Change theme fonts (optional)
On the Themes tab, under Theme Options, click Fonts, and then click the theme font that you want.
Step 3. Change theme background (optional)
On the Themes tab, under Theme Options, click Background, and then click the background style that you want.
Step 4. Save your new theme
On the Themes tab, under Themes, click Save Theme.
In the Save As box, type the name of the theme, and then click Save.
Note: By default, custom themes are saved in the following folder: /Users/ username/Library/Application Support/Microsoft/Office/User Templates/My Themes.
Step 5. Apply your new theme
Open the presentation that you want to apply the new theme to.
On the Themes tab, under Themes, click the theme that you created.
To see more themes, point to a theme, and then click . Themes that you created are listed under Custom.