The back is a Kona cotton in dark grey.
I will give more details on how I made this tablecloth soon. It was easy peasy. But taking pictures at night that turn out is not so easy peasy for me, so I will try to draw out something soon to show how I made it in just a few hours. It really shouldn't even take that long to make. I had a friend over and we talked more than we sewed! It is also on Amy Lou Who's blog. Check it out. On Friday's she has a show-and-tell day where other creative folks show what they accomplished that week.