In another forum I'm been on, the only users who generally use colored text are moderators when making a moderator comment.
Some users prefer to use certain different fonts and colors on the forum, but most of them are readable and don't bother me too much after I've seen it for a while (ET and Naps' text used to jump out at me a bit when I first saw it on the forum). Just don't use the "bad chat colors" (You know the ones) or too many colors and it should be ok.
Also, isn't the title irrelevant?