This is pretty self explanatory I had this idea today because my friend visits 4-Chan and it would be an awesome joke to see how he will reach when he sees "greentexting". Basically, if a user types ">>" anywhere in the message the rest of that message should be colored green, that's all I need. I'm using the Factions mod, so I'm not sure if it will be compatible since chat plugins don't do well with the Factions mod I have installed
You could type "&2" into chat (with a chat plugin that supports it) and it would accomplish that in the mean time
In case this is still relevant, I just made a plugin that greentexts a message on typing a single ">", typing two of them will not screw up the colours so if that's what rows your boat you can do that as well. here it is