title: Ttk background image
body: <p>Is there any way to import an image into python using PIL and set it as the background for a ttk mainframe that spans the entirety of a Tkinter root window? As of now I have only seen ways to do this is a Tkinter root. Also is there any way to make ttk self adjust the size of the image so that even if it's small it covers the entire screen?</p>
  
  <p>So to sum up I want an image to cover the entire ttk mainframe box without messing with me putting anything else in the ttk frame.</p>
  
  <p>for example
  if the pic covered the entire window, a command,</p>
  
  <pre><code>ttk.Button(root, text="Hello").grid(column=0, row=0, sticky=(N,S,W,E))
  </code></pre>
  
  <p>would still insert a button in the mainframe. Thanks :)</p>