: Use high-quality stock images for hero slides or to evoke specific emotions, such as landscapes for environmental topics.
: If you want a consistent look across many slides, you can create a custom background template using the Slide Master . Quick Tutorial: Adding Your Own Background Powerpoint Presentations Backgrounds
You can easily customize your slides by following these steps provided by Microsoft Support : : Use high-quality stock images for hero slides
Right-click the margin of your slide and select . Choose Picture or texture fill . Powerpoint Presentations Backgrounds