Right now to emphasize text we have three options.
Sometimes a little bit of controlled background-color might help to break large answers out into sections. For example, in this answer I'm talking about two distinct things, and I've interleaved the discussion. I think a bit of color highlighting would help to make the answer more clear:
It wouldn't be an all out color wheel. But I actually had in mind one highlight color (based on site theme) that could be used. So on meta, it would be some light colored variation of (108,0,0) (crimson)