Quick question: Is there a spherical mesh existing in game which could be easily resized in the cs to the size of a person, but without the sigil stone glow? If not, I could make one in blender, but i don't really need a texture on it for my purposes, so what does an untextured oblect look like in game? Does it just look gray or black, or make an exclamation mark?

There isn't, and without a texture, it'd look pinkish-purple. The !'s are objects that can't find their meshes.

You could probably use the Crystal Ball mesh. You would have to remove the 'legs' in NifSkope to get just the sphere, but it's doable. You could then scale it up in NifSkope as well.

Or you could use the sphere which makes a transparent aura around the sigil stones when you remove all other nodes (billboards, effects, its transparency etc.) from a copy of its NIF file in NifSkope.
I did that in an attempt to make visible-from-far placeholders for actors too far away to light up by a membrane shader (didn't work because the actors were out of processing range when they left sight range, thus didn't exist anymore, but doesn't matter) and I thought it was quite a nice and clean sphere mesh.

I think there are pearls, aren't there? Those could be resized to fit.