Twoion raised an interesting point about separating out what will become separate packages and if needed, bundling such repositories as submodules in an encompassing repository.

I have implemented this for the artwork repository (which for now doesn't exist anymore; I have yet to recreate it (clean history) and add the new deb8-theme as a submodule to it). I have also created several more repositories (each related to a cb-* package), that still have to be added to the teams and filled with their content. Feel free to start making pull requests!