Hello
@Zadanthalion,
This suggestion has been declined, as we don't feel like the current setup for housing and PMs is confusing to a majority of the players. Likely the constant changing of colours would be more confusing. We therefore don't think it would be worth it to spend a lot of effort on this, if it's not really needed/something a majority of players see as an issue. If we see that this is a bigger issue, we will think about changing it, though that might be difficult due to the limited colors we have available.
However, we have changed the color of quest chat to be more obvious and different from global chat, as that was a fairly large issue, due to players not receiving help when needed.
As for suggestion of having customizable chat colors, that is something we might look into in the far future, as we do think it's a great concept and idea, but we currently have other priorities.
Thanks again for the suggestion and have a great day!