Modify PowerPoint theme elements to mix and match colors and fonts. Learn all about using the PowerPoint modify theme feature here.
Once you've found settings you like, you may want to save the theme so you can use it in other presentations. If you only want to use the theme in the current presentation, you won't need to save it.
Custom themes have another unique and powerful feature: Any custom theme you save in PowerPoint can actually be used in other Microsoft Office applications, such as Word and Excel.