Radiant Creature looks nice, except for the Rainbow Aura blinding comrades as well.
Well, it dazzles them, it doesn't blind them, but I hadn't thought about it affecting allies. I'd imagine your fellow players would be annoyed at you for inflicting a penalty on them, even if it is only -1. I think the best solution would be to pay for a casting of ability rip (Serpent Kingdoms, p155) to permanently remove rainbow aura.
Maat, have you ever posted about that template in the Fun Finds threads?
I have not. I think I will though. Thanks for the suggestion.