To be honest, seeing smilies in nicknames iritates me a little.. I have tolerated colors since mr Hank wiseass used them, but there are people exagerating a little, I've even seen HTML coding in nicknames...
Plus color codes sure doesn't help the sorting on this site, so maybe I'll have to split a "visual one" and a "data one" for our data management (they usually show first in the fan club for instance, and search is almost impossible)...