With the help of scissor or blade, cut four equal lengths of the plastic lace make sure that they are perfectly equal to each other.
Tie all the four laces with their ends and then isolate them to form a cross shape in a way that one at the left, other at the right, one to the bottom and other at the top as you see straight down the knot.
As you start folding, begin with left strand moving it straight over the top of the knot towards the right side and bringing top strand straight down over the top of the knot towards the bottom at the top of the straight that was brought to the right.
Similarly, at the top of the knot fold the bottom and at the same time knit it over the thread that was brought to the left exactly below the thread brought to the right. Now heave all the four threads along their individual paths in order to have the braid tightened.
After you are done with braiding all the laces upto three inches working from the top of the piece to the opposite side then finally tie all the four threads in a single knot.