I wanted to share with you how I make wavy borders. It’s a great technique, perfect for a modern quilt and I love how it gives you a little mitred corner look. This technique is also used in the Modern Medallion quilt. My instructions below show a smaller block, however you can adapt it to any size and further instructions are provided in the Modern Medallion pattern for a larger quilt. Read on for the wavy modern quilt border tutorial.
Fabric and cutting guide:
 3½” strips of inside border fabric
 3½” strips of outside border fabric
Step one: Attach two inside border strips to the top and bottom of your block. Trim back to the block size. Repeat with the sides of the block to complete your inside border. Cut the outside border strips back so they are just a little bit longer than you block size. Place the strip down on your rotary mat, with the block on top, both right side up.
Step two: Cut a gentle wavy curve with the rotary blade. Discard the outer top of the inside border and the inner piece of the outside border, which should be under your quilt.
Step three: Sew the inside border to the outside border, down the curved seam (you can pin if you like, however I usually don’t). When you are looking at your curve, it will look wrong. It’s a curve and it’s supposed to! Don’t worry, it will make sense once you have sewn it! Gently manipulate the curve, without stretching the fabric, to fit and press well. Spray starch/Best Press if needed to get it lovely and flat.
When I sew my curves, I use the bottom fabric as a guide and hold the top fabric up and move it as I go. Doing it this way, means I don’t need pins and have a lot more flexibility.
Step four: Repeat step three on the opposite side of the quilt. Once the top and bottom borders are completed, repeat step three on both sides.
Step five: Trim the lock back to the desired size and you’re done!