I remember one time, way back when, that our Guild President, Carol Doak (yes THE Carol Doak) said she never pieced her borders. If she didn't buy the yardage to allow for the fulll length of the border, instead of piecing, she would place something such as a pieced block or something else where the join would be. It made her borders so unique & interesting. I have done it several times, but I'm not against piecing my borders, either. However, using the lengthwise grain of the fabric for your borders helps eliminate wavy borders as there is so much less stretch to the lengthwise grain. Just a thought.