Earlier today I found a thread I enjoyed about engineer-specific mounts.
Thus, this entertaining thread exists to brainstorm about mounts you'd want!
For entertainment purposes, try to keep it related to a class or a profession.
Personally I'd love:
Monk - some type of larger cloud, bigger than zen flying!
Hunter - the ability to mount your companion, of course!
Warlock / Paladin - all about the winged steeds!
Cooking - one of the large pots used for cooking found in Pandaria!