A useful but underutilized technique in PowerPoint is to set a transparent color in a photo. The original stock photo here was of two men set on a pure white background — perfect for this treatment.
First, I imported the photo into the slide then I selected Format > Color > Set transparent color. Using the cursor I selected the solid white background and PowerPoint 2013 set the entire background as transparent. Then I simply used Format > Bring Forward to move the photo above the other elements in the slide.
Easy-peasy!
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