Decent/Rare Mount To Get?

I currently use a Black War Bear as my ground mount and an Onyx Netherwind Drake as my flying mount. Whilst I'm pretty much content with my flying mount (as it took some effort/time to get) I'm gettng rather bored with my ground mount.

It just seems quite common and therefore I was looking to get another mount, but I'd like it to be somewhat rare. Do you guys know of any semi-rare ground mount which I would be able to farm or look out for without spending all day every day trying to get it?

On a related note, if you guys know of any type of "flying" mount which fits into what I said above, then I'd appreciate knowing about that aswell.

Many thanks in advance.