The simplest little card mannequins are a must for figure drawing. My classes have loved making these and really loved the resulting drawings.
body = 2x3 heads
legs = 4 head lengths
arms (including hands) =4 head lengths (with a little cut from the width)
My head templates were @ 5cmX 3.5cm, but you could use any size. I am really looking for an excuse to make a giant figure from large pieces of card, do I really need an excuse?
Here is another variation on this theme. Newtyle school needed some moonwalking astronauts, and that's just what they got!