Righteous Crystal

Brighthelm of Justice:  Drops from Hydross the Unstable in Serpentshrine Caverns.
Pauldrons of the Argent Sentinel:  Drops from Morogrim Tidewalker in Serpentshrine Caverns.
Justicar Chestguard:  Paladin only.  The token for this drops from Magtheridon.  There are several other similar chest pieces that could be used by any plate wearer.
Gauntlets of the Righteous:  Dropped by Warchief Kargath Bladefist in Shattered Halls.
Girdle of Valorous Deeds:  Dropped by Aeonus in Heroic Black Morass.
Legplates of the Righteous:  Dropped by Aeonus in the Black Morass.
Boots of the Righteous Path:  Dropped by Warchief Kargath Bladefist in Heroic Shattered Halls.
Icy Cloak:  Crafted by Tailors.  There are a number of other cloaks with the same appearance.
Bloodmaw Magus Blade:  Dropped in Gruul's Lair.
Aldori Legacy Defender:  Dropped in Gruul's Lair.

Details here.

Hero's Acumen

Unfortunately, the Robes of Acumen are no longer obtainable.  I still have mine from a Maraudon run way back in Vanilla WOW.

Heroes' Shoulderpads of Faith Priest Tier 7.  Token Spaulders of the Lost Conqueror drops in Naxx 10.

Acumen Robes No longer available.  Used to be a quest reward from Maraudon.

Chillbane Belt Drops in Hour of Twilight.

Resplendent Bracelets Green BOE

Mystical Gloves Green BOE

Kurkenstoks Alliance-only quest reward on Azuremyst Isle.

Surgeon's Needle Dagger drops in heroic Pit of Saron.

Manual of the Nethermancer Drops in The Mechanar.  (Book of Blood and Stormbound Tome--both made by incription--have the same appearance.)

Alternate versions

Runecloth Shoulders Made by Tailors

Rod of the Sun King Mace drops in The Eye

Staff of Dominance Staff drops in Molten Core

All details here.