So I stumbled across these lovely boots recently and thought that I must use them in a set sometime.
I was trying to create a new set for my warlock to use as I got tired of my current one and this is the result. Will look well together with the Wrath Guard if you are Demonology and using the talent Grimoire of Supremacy! And don't forget to hand your Wrathie some mathcing swords like two Armageddon.

Head: Crown of Burning Waters - (Heroic, Drops from Magmaw in Blackwing Descent)
Shoulders: Shoulders of Ruinous Senility - (Heroic, Drops from Professor Putricide in Icecrown Citadel)
Chest: Cat Lover's Vest - (Questreward in Northern Stranglethorn)
Waist: Vicious Fireweave Belt - (Tailoring)
Hands: Sister's Handshrouds (Drop from Lady Deathwhisper on 10man heroic.) Hallowed Handwraps goes great with this set as well and are easier to obtain.
 Hallowed Handwraps - (Drop from Warchief Kargath Bladefist in The Shattered Halls.)
Legs Barbaric Loincloth - (World drop in low level zones.)
Feet: Suspicious Slippers - (Questreward in Thousand Needles.)
Shirt: Rustic Workman's Shirt - (Tailoring)
Tabard: Purple Trophy Tabard of the Illidari - (I suggest you click the link for a better description of how to get it.)
Staff: Malevolence - (Drop from Halfus Wyrmbreaker in The Bastion of Twilight Raid.)
Back: Dory's Embrace (Bought from G'eras in Shattrath)