Bog Pauldrons Drops from the rare mob the Bog Lurker in Zangarmarsh. It's BOE, so your best bet may be the Auction House.
Emerald Breastplate Green BOE
Emerald Vambraces Green BOE
Emerald Gauntlets Green BOE
Emerald Girdle Green BOE
Greaves of Pacification Buy for Justice Points in Shattrath
Emerald Sabatons Green BOE
Dragon's Call Rare drop from the Shade of Eranikus in the Sunken Temple. Chance on hit to summon an Emerald Dragon Whelp.
Emerald Shield Green BOE
Tabard of the Wildhammer Clan Alliance only
Details here.
8/2/12 edit:
Here is the completed set on my paladin. I made a few changes from the set above.
Jade Warrior Pauldrons Quest reward from Hellfire Ramparts. Same model and color as the Emerald Pauldrons.
Chimaerascale Legplates Blue BOE. I lucked out and got these as a drop.
Stylish Black Shirt
If I only had a Tiny Emerald Whelpling pet, I'd be complete.
Details here.
Also, note that blacksmiths with Cenarion Circle rep (not Cenarion Expedition) can craft the Ironvine Breastplate, Belt, and Gloves, which are identical in appearance to the corresponding Emerald set pieces.
