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The last one had embroidery details, so I worked with it as best I could. I asked the piecer how she had attached her border strips. "I sewed on strips and trimmed them." This is not the best way to attach the borders.
Below are two links that have information about a better way to attach borders. First, is an online article by Janet Wickell. The one from Longarm University is a pdf that you can download.
http://quilting.about.com/od/straightsewnborders/ss/straightborders.htm
http://www.longarmuniversity.com/tutorial%20page.htm#basic
They both recommend measuring your quilt to determine the length that the border should be. I would add that when I measure the quilt sides I measure along the seams, because sometimes the raw edges of the fabric stretch a little. You don't want wavy borders. Sometimes, it doesn't quilt out.