Blanket stitch is a line stitch. You can use it for a textured line stitch or as a filling too. I often use this stitch along horizon lines for extra interest.
Bring your needle up and pick up a little bit of fabric with your needle along a vertical line. Wrap the thread around the needle and pull through.
Make another stitch by picking up a little bit of fabric vertically and wrap the needle around as in the first stitch. Pull the needle through.
Continue to the end of the stitched line.