I seriously doubt this is possible but it would be neat if the clicky randomly changed your appearance to any of the models of any of the creatures you killed in the quest

I think just having a fairy illusion would be a bit of an insult considering the hard work that goes into the quest.
Something totally unique and cool would be best and yes, I agree that the current effect is a bit lacking considering the time invested; something tangible would be good. Perhaps a chance to reflect spells back on the caster (20% or something).