This is not an ELT approach, rather something from the pen of Edward de Bono. And like many things invented in the 20th century, it can be readily adapted to the eclectic world of CLT.
Six thinking hats:
● http://sixthinkinghats.com/
● http://www.debonoforbusiness.com/asp/six_hats.asp
How to use this in moodle wiki at 7,45 in this http://www.youtube.com/watch?v=_sEcl3fpPJc
Other sixes include Lindsay Clandfield's Six Things blog.