One really nice thing about CW is that you can make any size project easily. I started out making the first 16 unit square thinking I would stop at a pillow top (like the wine colored one in my previous pictures). I was almost done that when someone asked me to show them how to do it, so I made another 16 unit square. I thought it would be easy to turn it into a table runner at that point. Then, I was asked to teach it in a class... so it just kept growing. Mine is now about a lap size top but, the really cool thing is, if I decide to make it larger, I can just start adding on to it again!
My base units each were cut at 8.5 inches with 1/4 inch seams so each 16-patch section would finish at 16 inches.