Cropping a picture to a shape
It is worth to know that, instead of cropping a picture to a conventional rectangle, you can crop it to a circle, a triangle, an arrow, or even a thought bubble:
To crop a picture to a shape, do the following:
1. Click the picture to select it.
2. On the Format tab (under Picture Tools), in the Size group, click the Crop button and then choose Crop to Shape:
3. Select the shape on the gallery that opens: