Cross bar with link trellis
A diagonal trellis decorated using detached chain stitch and straight stitches. The name link comes from the alternative name for detached chain stitch of link powdering stitch.
For more background see the entry for trellis stitch.
Method
Start by filling your shape with a grid framework of basic Trellis, either square or diagonal like this image.
Complete a straight stitch over each intersection.
Fill some of the squares with a detached chain