I reckon it would be pretty cool if you could buy the right to permanently set your text colour for all chat rooms. Currently you can use /tint to set your chat text colour in a specific room but it would be awesome if you could set your chat text colour for all the rooms you enter without having to type this out. Maybe have an additional profile option that you pay 300 or 400 coins to unlock, where you can set you text colour to a specific hex value and any room you enter your text is automatically that colour. Using hex values would be awesome as well because it would give a lot more variety than the few available colours atm.
Just another way for users to customise their game profile and a great excuse for buying a few more coins

**EDIT**
On second thoughts maybe it would annoy players having the chats looking like a rainbow? What do you guys think?
Possible solutions to the potential rainbow problem:
Raise the price of this function super high so only those who really want it bother to pay for it... this would also add to its value since you would be more unique in the chat. Maybe like 1000 or 2000 coins?
Or you could have an option for players to turn off coloured chats and only see the standard colouring?