I call that an orange peel continuos quilting design. If is really handy when quilting square blocks in machine FMQing. If you have a medium to dark quilt top, use a piece of paper to figure out one curve from corner to corner on one block. Cut out the paper and glue it to a piece of card stock. Use the card stock template to trace the lines on with white chalk. Do not use coloured chalk! You can use your FMQ foot to quilt the lines or since the design is large, gentle curves can be quilted using your walking machine foot.
If you are hand quilting, you can pin the paper template to the quilt and quilt along the edge.