Black Hades is grey white (no color).
There are several good-looking options for you
Black / Grey
-Armor: Corpsemourn / Steel Carapace
-Helm: Upgraded Howltusk / Veil of Steel / Giant Skull / Steel Shade
Grey White (normal)
-Armor: Any runeword armor or Black Hades
-Helm: Any runeword helm or Guillame's Face
Grey White looks nice paired with Black.
Gold
-Armor: Trang-Ours
-Helm: Rare helm or Perfect topaz as first Gem in three socketed Helm. A Gold Great Helm paired with Trang's looks awesome.
Gold/Black
-Just mix and match above
Red
-Armor: Rare Red Boneweave, Shadow Plate or Sacred Armor, or use a P Ruby as first gem.
-Helm: Rare red helm or P Ruby as first Gem in a three socketed Helm.
Red/Black
-Just mix and match above
Red/Gold
-Firey!
Purple would probably look nice too especially if you can put a P Amethyst in Armor. Blue and Green probably won't look too good, except the green Unique bone helm. Black helm on blue armor might look nice, but it is unlikely to find Tyrael's might.
For helms, Circlets, Helms/Casques/Armets, Bone Helms, and Great Helms look best. My favorite is Great Helms or Circlets, although Armets look nice too.
For Armor, Archon Plate, Boneweave, Gothic Plate, Hellforge Plate, Full Plate, and Ancient Armor varients look best. The best-looking is Full Plate or Ancient Armor.
Have fun =)