If you want to help designers with developing unique looking sites then provide a very basic template, with no extra design "bells and whistles", from which we can then add unique design ideas. Use a mixture of greys and if a line doesn't have a definitely purpose then either leave it out or use a very faint grey to minimize it's affect.
Not only with color change, Do it like vBulletin if tags: https://www.vbulletin.com/docs/html/template_conditionals or Smarty http://www.smarty.net/ so that everyone can do what you want easily..