What if you want to use a Background that is not found in the collection of preset Backgrounds?
Good news! You can also use any image as a background. 

Using Custom Backgrounds

1. Under the Background section in Photograph Setup, select Panorama in the drop down, then click the Import button:
   
   You can now select any image we want!
   For this example, we'll be using a custom green field:
   
   
   
2. Since we only see the photo through a single window we want to see a bit more of what was captured in the photo through window.
   By increasing the Scale and adjusting the Offset we can achieve this.

   
   
   

3. (Optional) The cloudy background image seems a bit off when it's rendered with a sharp sunlight, let's try the Cloudy/overcast setting found under Lighting & Shadows (Realistic). (Overcast article)