Wikki Stix are a great way to work on visual-motor control. I prefer to use them to outline the area the child is going to color. That way, there is a tactile border on the paper and they get a stronger reinforcement every time they bump into it with their crayon/marker. Once children are working on handwriting, you can place a Wikki Stick on the line and it can serve as a tactile boundary for them to make their letter(s) “sit” on the line.