I am not sure I follow what you mean. Mythruna is meant to be a mideval block building game. I am pretty sure they had paint in mideval times.
Aaactually... It's planned to be more like an RPG than a building game... but Paul
has considered a block coloring system.
This was actually asked previously, and should have been pretty easy to find using the
search tool (Don't worry, you're not in trouble for it or anything.).
For posterity, here is the exchange Paul and I had about paint in Mythruna.
Maybe bricks should just have a color value. There are SO many variations of clay bricks out there that it may be better to just create a spectrum of realistic brick colors and let people figure out how to make their bricks that way.
Colors like you are talking about are part of the block type. Each shape is also part of the block type. The combinatorial explosion adds up pretty fast. It's why I plan to try to do colored blocks more as add-on paint instead of part of the blocks. Sort of like another lighting layer but not really.