When I have time I want to play with it. You can do it if you have a color chart. You have to have a color change html code for each letter (look at her code) and substitute your own color codes. Once you see that, you "sandwich" each letter of your reply in between color code html tags. Make sure you get them all nested and closed properly and you should be in business.
There are html color charts on the web and I have one somewhere myself but don't want to take the time to mess with it right now.
You can also work up some color code changes in a graphics program like psp or photoshop and then substitute them into classy's code.