Assuming you mean from the source files (i.e.: modifying the source code to score and lists)...
You'd simply use the color code in the output.
ch_printf( ch, "&cYou have &C%d&c out of &C%d&c mana.&D
", ch->mana, ch->max_mana );
Note: I think the &D code isn't in FUSS. Might be. It's a reset color code.
That above snippet would produce a multi-colored line of text, involving two shades of cyan.