Blender - some late night testing
EDIT: After one hour of testing the possibility to color the instanced objects, I've found a solution. Not the way I thought it is possible, but with an object info node and some tweaking in mapping it worked sort of. Next time, I'll present the result.
Playing (like most blender users right now) with geometry nodes. Damn, I think it could have helped, being more concentrated in math classes. ;)