While it's not even close to viable or necessarily wanted by many players, I've been having a blast with playing Unholy as a ranged class.
Ebon Fever (faster Virulant Plague damage and causes WAAAAAAY more damage than the Risen Skulker due to the innate mechanics of Virulant Plague. It also gives you something to do because you need to Outbreak more, etc.)
Epidemic (my main ability unless I can use Clawing Shadows to burst a Festering Wound)
Clawing Shadows (I LOVE this ability! I use it to pop Festering Wounds inflicted by my Ghoul or when I'm out of Epidemic charges. I also, depending on how the mobs are running around, drop my Defile at my feet and Clawing Shadows AoE all the mobs ---- the mobs do not need to be in the Defile for Clawing Shadows to become an AoE attack).
Debilitating Infestation (I chose this talent because I can't handle the Abomination model anymore lol - it also allows me to kite/stay at ranged easier as well as stack up more Defile Mastery charges via the slow effect if I drop my Defile on some rounded up mobs.)
Lingering Apparition (just a tad more <IMHO> "needed" mobility)
Infected Claws (the ONLY source of Festering Wounds unless you accidentally get within melee range - pop those suckers!)
Defile (two uses... 1} damage slowed mobs and build up some extra Mastery for extra damage and/or 2} turn Clawing Shadows into an AoE ability)
Combine all that with the 2 & 4-piece bonus' and the Reaper's Harvest trinket and you have your very own sub-par but VERY fun Necromancer (still have Army of the Dead and Gargoyle too!) The above build still constantly procs Fallen Crusader so super mini heals are served right up.
I understand this kind of build has been done before and some folks may even be annoyed that I have the audacity to utilize it in invasions due to my reduced effectiveness... BUT I'm enjoying it immensely!!! Crazy thing is it's actually almost at my Frost's level of single target damage and slightly better than my Frost's AoE damage AND I'm much, MUCH safer ... although maybe I just really suck at Frost.