Hmm..  If you check the cels.org page..you will 
see a section where people do fan cels for a 
fee...commission.  Is that legal?

   I don't think *ANY* fan cel is technically 
legal.  However, because the company be it AIC, 
CLAMP...etc. does not want to be seen as a fan 
cracker, they do not crack down on it much.  Since 
tehnically, AIC has copyrighted it's 
characters...anyone that draws a ryoko and displays 
it without paying royalities and such is doing 
something illegal.  I once wanted to reference some 
artical in a paper to use in a class and I 
contacted the newspaper.  They actually stated that 
royalties must be given.  Usually, I think they 
(other newspapers) don't really care...but if they 
*could* do something if they wanted...

But i'm rambling...

I've seen a lot of fancels on ebay.  I'm not sure 
what to say...I guess I'm just rambling at this 
point ^^.