Split stitch is great for outlining or filling in small parts of a pattern with a textured stitch. I would recommend using an even number of threads to keep it looking nice and neat, and watching your stitch sizes for consistency.
Here's how ya do it:
Bring needle up at point A and re-insert at point B, pulling the thread all the way through to the back, making one stitch (photo one).
Bring needle up at point C (photo two) (in the middle of the stitch you just made) and then down at point D (photo three) pulling the thread all the way through to the back.
Photo Four shows the first completed split stitch.
To continue, bring the needle up at point E, in the middle of the second stitch (photo five) then down again at point F (photo six).
Repeat these steps until the desired length has been reached.