I also use the color to black and white feature. Great tool!
Recently, I had a top on the design wall but I didn't have all the background fabric. While I was waiting for that to arrive, I started some of the piecing, using what little background I had. Well, I kept getting lost. Thank goodness, I had snapped a photo before I started. It made a great reference to keep me on track. I haven't figured out how to resize my photos so they will fit here but you can see it here and see why I could keep getting lost.
https://www.flickr.com/photos/wheate.../in/datetaken/