Silver Pig

Special promotion only for China servers.

Blizzard's Recruit-A-Friend Program gives you multiple reward choices! You can only pick one reward per account recruited. The reward is made available in-game through the social tab on the chat window to the recruiting or "veteran" account after the new recruited account has paid for two months of game subscription time. A pop-up message lets you know if you have a new reward ready to choose.

Mount Reward Options:
[item=37719] teaches Swift Zhevra - The original RAF mount, ground-only. Grants the achievement Friends In High Places.
[item=54860] teaches X-53 Touring Rocket - The second RAF mount, a 2-seater rocket. Gives the achievement Friends In Even Higher Places.
[item=83086] teaches Obsidian Nightwing - The third RAF mount, which transforms the owner into a winged black catlike mount that can carry a passenger on your back. Grants the achievement Friends In Places Higher Yet.
[item=106246] teaches Emerald Hippogryph - A lovely green and orange hippogryph mount. Gives the achievement Friends In Places Even Higher Than That.
[item=118515] teaches Cindermane Charger - A blackened winged horse covered in bright orange flames. Grants the achievement Friends In Places Yet Even Higher Than That.

And pets, originally available only as limited-time rewards on the Chinese & Taiwan servers:
[item=34518] teaches Golden Pig.
[item=34519] teaches Silver Pig.
[item=49664] teaches [npc=36910].
[item=46894] teaches [npc=34930].

I have all of the mounts from RAFing a second account several times. If you're debating which reward to choose, I'd recommend either of the two-seater mounts: X-53 Touring Rocket or Obsidian Nightwing. The ability to carry a passenger is perfect for your RAF adventures!

Since the last update to RAF was the addition of the Cindermane Charger in early 2015, it seems that we might be due for a new RAF promotion sometime soon.

Silver Pig is now available through the updated Recruit-a-Friend program.