Just to clarify things a little further the three color variations will be used on 3 different sites so there will be 3 different instals. Color variations i like can be seen on
www.digg.com,
www.silverorange.com,
www.xanga.com and
www.revision3.com.
The 3 sites will all work on the same script so there will be no additional design/CSS work. Just separate instals.