i am not a developer or add-on creator, i know absolutely nothing about it, but i have ideas, here is one:
something that makes it easier to select colours for your different guild chats.
feature ideas:
could select from pre-made colours, that do not clash with the colours used by the game already (the yellow for achieve's, the green, blue, purple, gold for items, etc.)
the ability to save fav colours
save profiles for diff cha'rs, this would allow for easy transfer of 'colour schemes' from one character to another, and different schemes for different cha'rs (if u like)
the mod itself could be de-actived when not in use, lets face it - it wouldn't need to be something that would have to be running all the time, would it?
something like this may already exist, i haven't found it tho...
if anybody would like to do this - go right ahead, just remember where u got the idea from ;P