Druids

Simple and Druidic. I really like the staff.

Feathermoon Headdress

Veil of Turning Leaves

Titan-Forged Leather Chestguard

Seafoam Gauntlets

Firescar Sash

Boots of Natural Grace

Twin's Pact

Night Elf Mage

Night Elf Mages were another race/class combo that became playable in Cata, although I don't see many around. I was trying to get a Highborne look, with bright, glowy, arcane like colours.

Hallowed Garments
Mantle of the Tempest
Crown of Endless Knowledge
Belt of the Depths
Arcanist Gloves
Xintor's Expeditionary Boots
Saronite Spellblade
Prison Manifest

Sentinel

Sentinel's armour is a tricky one to find. The shoulders are mail, and so I have found some other mail gear that gives the same colour and a simular look to the Sentinels that we find in game.

Impenetrable Pauldrons
Abyssal Mail Greaves
Scaled Greaves of Patience
Impenetrable Breastplate
Fathomheart Gauntlets
Frostreaver Crown
Netherfury Belt

Elune Be Praised

Worship the Mother Moon in this beautiful elegant robe, also comes with a glowy lamp!

Mooncloth Robe
Netherweave Boots
Netherweave Belt
Lamp of Peaceful Radiance
Pauldrons of Arcane Rage
Dathrohan's Ceremonial Hammer
Crown of the Ogre King
White Swashbuckler's Shirt
Mooncloth Gloves

Druid of the Talon

Druids of the Talon, one of the guardians of Mount Hyjal.

Feathered Breastplate
Ironfeather Shoulders
Nordrassil Headdress
Nordrassil Chestplate
Nordrassil Feral-Kilt
Heavy Earthen Gloves
Might of the Timbermaw
Fordragon Blades

Druids

I think the druids always have some of the best looking tier sets, and I shall be making mine look like this.

Cenarion Helm
Cenarion Vestments
Pauldrons of Malorn
Ahn'kahar Handwraps
Flamescarred Girdle
Pillar of Ferocity