I've edited all the textures for the oblivion cave door to change it from red to blue, but the door still "glows" with a reddish tint in many places. I can't find this value, help?

That's probably due to the "Emissive Color" settings in the .nifs. For instance, open the obcavedoorway.nif in NifSkope and expand NiTriStrips # 24. Click on NiMaterialProperty and look in the Block Details. You'll notice that the emissive color is set to ff0000 (red). Change that to 001eff (blue) and it should fix the issue.

Thanks, got it!