Here's my attempt to make the Druid's spirit form look a bit more like a natural animal, instead of the twisted lycanthropes of the vanilla game.

To install, first locate the file at "Pillars of Eternity/PillarsOfEternity_Data/assetbundles/prefabs/objectbundle/spiritshift_cat.unity3d" and rename it to "spiritshift_cat-backup.unity3d".  Then, rename whichever version of the mod you'd like to use to "spiritshift_cat.unity3d", and move it into the objectbundle folder.

If you're interested in creating your own reskins, the way I created this one was with a hex editor.  I first extracted the texture files from the assetbundle with Disunity, then I opened both the assetbundle and the .dds in a hex editor, found the part of the assetbundle that matched the hex data from the .dds, and pasted over that data with the hex data from a new texture.

If you'd like to use these textures in your own mod, feel free to do so.  You don't have to ask permission, but please include attribution.