I like moths. They are sort of fascinating to me. Also very beautiful. Some perhaps even more then butterflies. Though I don't have any real though or experience about the spiritual significance of insects. My guess is it is the same as with every other living being on planet Earth. Seeing how everything by itself is in balance and every little creature has its own role to play and keep in the great balance of Earth, I would say, every living being has the same spiritual significance as the next.
this might hold some interesting info
http://www.whats-your-sign.com/anima...lism-moth.html