You can import any image as a background layer to enhance your design. This may be a previous plan from a contractor or perhaps an image of your site from Google maps.
To add a background image, select the Insert command on the Home tab and click on Picture.
In the dialog that pops up, browse your computer for the image you want to add and make sure you select Import as a Background Image.
Click OK to import your image into a background layer. This image will live in its own layer that cannot have other shapes added to it.