Well, have you tried setting mice afire? They can provide light in castles...for a while.
Personally, I prefer radiated rodents. They glow nicely and can sponaneously generate new rodents (mutations are soooo cool).
Well, my brother glows rather nicely... but it's so
hard to keep track of him (you'd probably think
"a strange, glowing man, how hard can it be?")...
it's harder than you think. You ever try following
him around here? He just disappears on you.