That's basically it, but I have them draw a wavy line first, then place
4-6 dots on the line. They draw a new line on each side of the original
line about 1/8 of an inch on either side then keep going from there.
Tell them the first three lines should look like linked sausages. If
this isn't clear, I can email some step by step images to you tomorrow.
And thanks for the feedback!