How to make modern look for pictures in the PowerPoint slide
To create torn edges for a picture, do the following:
1. Add the shape from the letter (see How to create letters with pictures in PowerPoint slides), in these examples was used letter l from font Papyrus and a bottom part of letter T of the same font:
2. Just duplicate them and position each of shapes:
3. Group these shapes, format them, and add pictures (see How to make modern picture design in PowerPoint slide for more details).
Add any other adjustments you would like.
See also this tip in French: Comment rendre les images modernes dans la diapositive PowerPoint.