Drops in Zul’Aman and would suit a Troll Priest or Warlock down to the ground.
Unfortunately this is a reward from a TBC quest but I love it’s purple crystal look. The whole chain can be found here.
This is Alliance only but would work well as a part of a Priestess of Elune outfit. You can purchase it from the Argent Tournament for 25 champion seals.
After all, you can’t go wrong with skulls, especially these cute little sugar skull look alikes. It drops from the Captain’s chest in normal Halls of Reflection.
This I think is my preferred choice, although given how bright the caster weapon enchants are, you might not be able to see the skulls too well.
There does seem to be a bit of theme with blue daggers. If I were a dagger wielding Frost Mage, I think I’d definitely go for something which looked like this. It can be found on Mennu the Betrayer in Heroic Slave Pens.
This looks like a slightly evil back-scratcher, perfect those shadowpriests and warlocks amongst us. Dropped by the same demon doggy it’s named for, it can be found in BWL on Chromaggus.
I love the fact that this blade looks like it’s dripping in blood, perhaps unrealistic for a caster blade but awesome none the less.
This is a random TBC world drop but there are certainly plenty on my server’s auction house.