Basically, today's stitch, Croatian Stitch, is a Laced Running Stitch.
This one we have already done. The point with Croatian Stitch, though, seems to be to fill in a shape.
I found Croatian Stitch at Kimberly Ouimet's blog. She in turn had seen it in Mary Webb's Embroidery Stitches.
You start by drawing a shape and stitching the outline with evenly spaced Running Stitch.
After that use a (contrasting) thread to lace the stitches to fill in the shape.
Now I am not sure if the lacing thread can to go through the Running stitches only once,
or if twice is possible...
With this double threaded way, the shape really IS filled in...