Start with how many strips you will need (do not think of WOF as 45", it usually ends up shorter. I think of it as 42" just to be safe). I would plan on 10 strips (think a minimum of 2 1/4 per side and extra to cover the width of a 4" border). So, if you only have a yard of fabric, your strips can not be wider than 3 1/2". If you did cornerstones, then you could just get by with 9 strips and they could be 4" wide. When I piece border strips (2 1/4), I tend to put the short piece in the center of the border for a balanced look. Depending on the fabric, I will sometimes topstitch the seam with a decorative stitch drawing attention to it rather than trying to conceal it. I think of it as another opportunity to embellish.