The use of color in posts has been discussed before, and if I remember correctly, the general feeling was that in general it should be discouraged.

So although in principle I like your idea, I wonder: will the people who -against common opinion- still use color go to the trouble of figuring out how to use whatever new scheme we come up with, so that it is readable by everyone? I doubt it.

I don't remember what the comments about color were when the discussion about restricting HTML in posts occurred, but it seems to me that a better solution may be to filter out color tags altogether.

I haven't seen enough people using color to think that this is a real problem yet, though.

--ZZamboni