As long as your Finder window is in icon view, you can add a photo as its background. You do this by going under the View menu, under show View Options, and in the background section (at the bottom of the dialog) choose Picture. Click on the select button and the standard Open dialog will appear in which you can choose the image you’d like to appear as the background of your window. Click OK and that image will appear. Note: This works only when viewing the window in icon view. if you change to list view, the image will no longer be visible.