I just did this recently. After designing an original pattern, I took a new sheet of graph paper to make my working sketch on in preparation for making the first actual fabric block. Somehow, in the transition from design page to working page, I changed the pattern (a lot) by adding an extra 4.5" row all the way around it. I even cut and sewed up the block from the work sheet, and sent a photo off to a couple of friends for critiquing. I knew something was wrong, but couldn't figure out what. LOL. It just didn't look right. So I went back to the original pattern and compared to my working sheet and DUH!!! How on earth did I do that??????... So to friends I had to say, please disregard that block, lol, it is all wrong. That mistake also set me back on my project 2 whole days. grrrrrrrrrrr