A little kTurtle experiment
Load up kTurtle and throw this at it. Then change the angle to 120 instead of 90. WHOA!
reset
$angle = 90
$unit = 30
repeat 4 {
forward $unit * 3
turnright $angle
forward $unit
turnright $angle
forward $unit * 2
turnleft $angle
forward $unit
turnleft $angle
forward $unit * 2
turnright $angle
}