Hey there,
I searched and i found no similar topic so in case there is already functionality like this please let me know how to do it since it would make the project more efficient.
Basically it is about the color of the columns so that two phases of the same state, e.g testing will be more visible and less confusing. Or if you can have some sub-columns.
Check the link below which was my inspiration and let me know what you think of it.
This looks like a duplicate of Colors for columns and ability to bold or change color of text in titles of column and tasks