I've never skinned for spits or hurris because I find them so limiting in what they have. There's a chance that the few Hurri2Ds in service (relatively speaking) were converted in the field, so they kept the camo they had before? (wild conjecture here)
Anyways, finding variation is the hard part. They're mostly the same it seems (which sucks for us skinners). Find me anything, something, whatever, and I might give it a shot.
EDIT: I found a couple models (one a IID, one a IV) and they have exactly the same paint as the default skin. Not an exhaustive search, just a heads-up that I've not found anything yet.