Ravika, near the docks (55, 11) sells some items that were only available during the Darkspear rebellion:
- Griftah's Authentic Troll Shoes (i.e. "hide shoes")
- Whole Body Shrinka (toy that makes you ant-sized)
- Sen'jin Spirit Drum (toy that brings out giant troll drums)
- Xan'tish's Flute (toy that summons snakes)
For alliance, there's a vendor (Lenny, in SW Harbor 28.27 at that sells a Lucky Shirt (it's a lookalike, but the original Fine Cloth Shirt has been discontinued). The shirt is BoE, but it may not add to your appearance collection yet, so double check before you vendor it.
There's also a cosmetic bonnet alliance can unlock, in the Broken Shore scenario. I've not done it, but wowhead has instructions.