This is really valid for 3e Druids, and I brought it up in the thread on Githzerai Faiths. It's a question of what would a Druid from Limbo bother wildshaping into? Since wildshaping into common animals that exist on our world such as bears and wolves and chinchillas just seem kind of boring or out of place for a Druid from a place that probably doesn't even have those animals.
While I guess it's easier from a game perspective to use the stats of bears and wolves and things readily in the Monster Manual, I think there needs to be a list of things that are equivalent to a mundane animal that is more likely to live in Limbo. I randomly made up a:
Slaurr (Bear): A cumbersome beast covered in thick writhing cilia tendrils, has a single large eye, and five limbs.
Anyone else have other ideas?
I always think of the elements dying and crumbling to dust when I think of Limbo (sort of like the Elemental Chaos of 4e), so my suggestion would be the smaller sorts of elementals, paraelementals, etc. But that is not in any way a professional opinion... Just my first thoughts on the topic.
-will