Possible to apply a predef colortheme to only a few pages?

[Cloud]

I did a website a few years ago and because the site only had 3 named colours I simply used different master-pages for each section, but eventually as the site grew we went with what is suggested above, 2 separate websites

[Red14]

Thank you all, guess two interlinked sites is the easiest to manage...no, the best way to be creative, that's the word i needed.