[Typo3] Select a background color for each page

[tREXX]

Hi there,

The backend user should be able to select one background color out of a few
predefined background colors for each page in the backend. How can i do that?

First i thought i could use TSConfig for that purpose. But than the TCConfig
is also available on child pages ant i only want to have the bg-color on
certain pages (completely independent from the navigation-tree).

Someone suggested to do it by passing an URL parameter. But that's not how
i wanna do it. 

Any ideas how to do this?

Thanks a lot,
tREXX
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