I made a sudoku quilt for my GS last summer -- wanted it to be a twin size, so I made rectangles of about 6.5 by 9 inches, with 1.5 inches separating the 9 patches and 2.5 as a first border, probably about 7.5 inch outer border. It turned out very striking -- it's at the LAQ scheduled for this week. I'll try to post a picture when I get it back! Good luck with it -- I really had fun with it!!