Moved here from the general coding forum since it deals with one of our snippets.
As for the question - you need to open up color.c and find the pc_displays array, where the names are defined. You want to change room names and say, so you'd look for "rmname" and "say", and count from the start of the array down to the one you want. Begin counting from 0. When you get to the one you want, go down to the default_set list and find the matching color value for the same number. Change that to whatever new color you want to have set by default. Yes, it can be a bit of a pain, but that's how it's done