Kaye Wood has a video ~
http://www.youtube.com/watch?v=bN8fJn39Mls ~ it uses strips and her 'star maker 6' ruler
Another is from Marci Baker ~
http://www.youtube.com/watch?v=DWpSETMbws4 ~ From her book 'ABC 3-D Tumbling Blocks and More' plus a 60 degree (Clearview Triangle) ruler