I've been reworking the core systems of the district mod to allow being able to add new colors, or even player generated colors to roofs. This required the code to mostly be rewritten and changes on how the data is stored, which means that any changes you've made will be lost when the new version comes out. However, steam allows you to choose which version you want to download so those who don't want to lose their coloring progress, then you can simply choose the older version to use. I''m steadily making progress on the new system and plan to do more things with it before committing to a full release.

New System finished - Just polishing the code and checking to make sure I didn't miss anything.
Adding Menu Options via Zat's ModMenu

Ability to choose the Renderer the color change applies to. (Allow to change color of sub-structures)
Display of Current Selected Color
Expand + Dropdown UI
Full-Compatibility with All Non-Mod Buildings
Player Added Custom Colors

• Color Picker
  
• Color Preview of Building

Remove Custom Colors

Adjust the Max Amount of Swatches
Adjust the Default Swatches Via Mod Menu
Nameable Districts
Multiple Building Selection
Texture Compatibility (Not just Roof Colors but entire textures)
Model Compatibility (Change the entire model)

If you have any suggestions feel free to comment on this discussion post. I greatly appreciate any suggestions or information about any bugs. Thanks :)