- Click on the photo you want to edit.
- From the Photo Tools tab on the right, click on the Border option.
- Click on the color box, just underneath the "On" selection
- Select a color from the color panel by clicking on it, or use the eye dropper tool to match your border to any color.
- Click "OK".
To change the color of all image borders on the page, click "Apply to Page". To apply the change to your entire book, click "Apply to All".