Blend with Forest: Options?

[Meowakin]

I absolutely love the flavor/idea of this spell! But it would be 10x more awesome if it was possible to choose the type of tree used for the spell, similar to the OSI Polymorph.

I've mentioned it elsewhere, but I'd also like if it did something about being revealed by woodland critters (assuming you don't have high hiding). It's rather a shame to have high paganism and any woodland critter would sell you out for free. My thought would be maybe a longer term, lower magnitude Hiding skill minimum, similar-but-different from the General Invisibility. Wouldn't likely help versus the 'big' woodland revealers but I'm hopeful it would be enough to block some of the minor ones.