For the turned hem you could work the border of the design in Hardanger satin stitch or Hardanger buttonhole edge stitch. If you choose to do a turned hem be sure to add several inches all the way around the piece of cloth for your worked design.
Red Yellow Tulips
Click to enlarge photo
Photo shows my Hardanger with Tulips design finished with a turned hem.
The 22 count fabric that I used for this Hardanger design is weaved with two threads as the fabric’s thread. If you strip a thread from the raw edge of the fabric you have two strands. When taken apart and used as a stitching thread the one strand of fabric thread is about the thickness size 12 of a perle thread. This is what I used, a single strand of the actual fabric thread to stitch my turned hem so that the stitching for the hem did not show.
I have only worked a turned hem twice, so I am no expert.
To view a great discussion of working a turned hem with mitred corners see Mary Corbet’s discussion ‘mitre corners’ on her website http://www.needlenthread.com/