I think the Netherwing Drake Mounts are gorgeous.
First you must be Exalted with the Netherwing Faction.
WOW Pro has a nice guide on how to get exalted with the Netherwing Faction here. At the end it also details how to get your mounts.
The mounts require level 70 and artisan riding.
They cost 200 gold, but I believe are cheaper with your faction discount!
There are 6 different colors of the drake:
1. Azure Netherwing Drake
2. Cobalt Netherwing Drake
3. Onyx Netherwing Drake
4. Purple Netherwing Drake
5. Veridian Netherwing Drake
6. Violet Netherwing Drake
I was not a fan of grinding rep for this faction. I was so tired of doing those dailies and didn’t find them all that enjoyable. I really enjoy my mounts though so it was worth it!