Draw special attention to words within a PowerPoint using WordArt. Once you place WordArt (Insert tab–>WordArt) on the desired slide, enter the text. Select the text then from the Format tab click Text Fill–>Picture.
Browse to select a picture. After clicking open your photo will be inside the WordArt characters.
Here is the photo I used in the WordArt example above. It is from Jemez Springs, New Mexico.
Download my PowerPoint keyboard shortcuts guide.