1. Joe K Said,

   There is grey hat. A grey hat would be an SEO who does not necessarily subscribe to 100% of all white hat best practices, yet does not knowingly and willfully use deceitful or malicious practices.

   Some white hat consider grey hat at best, risky and at worst reportable black hat SEO.

   There is also a gentleman that says he does blue hat SEO, which I am not 100% sure of, but seem to mean advanced SEO.
   References :
   http://www.johnon.com/220/white-hat-sissies.html
   http://www.beanstalk-inc.com/tactics/grey-hat.htm
   http://www.bluehatseo.com/how-to-be-a-gray-hat/
   http://www.bluehatseo.com/blue-hat-technique-19-keyword-spinning/,

2. organicfan Said,

   How about green hat SEO?

   http://tinyurl.com/seo-ellite
   References :

3. Paul Dylan Said,

   Grey hat (in the middle) typically what you may want to do to stay within the guidelines but push to the envelope a bit.
   References :
   http://www.palatnikfactor.com

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