Yeah, because I remeber Shankdog's sig was a light blue color with his system specs (just like the code he posted above).....I will go try this for myself.
EDIT: Nope, not working.
Although, I kind of have to say that if I was running FITES, I probably would not enable HTML signatures or HTML in the messages at all for the sole reason of if someone forgets to close a tag, or otherwise screws up their syntax, it will screw up the remaining portion of the page. That's why BBCode is around and BBCode seems to give any functionality you need for the most part.
Can you do BBCode in the signatures?