title: Recommendations for black and white color scheme with ggplot2
body: <p>I'm using ggplot2 to produce many diagrams structured like this:</p>
  
  <p><img src="https://i.stack.imgur.com/dPU4H.png" alt="enter image description here"></p>
  
  <p>Is there an easy of producing something that looks good in black and white? I did read this <a href="https://stackoverflow.com/questions/2895319/how-to-add-texture-to-fill-colors-in-ggplot2">question</a> but it still is producing a colored fill.</p>