I think it would be good if you could add textures to the 3D items. It could just be a flat and you then put the texture on it, Just like normal item textures.
I think it would open a lot of possibilities up.

I got no idea what this has to do with textures?

3D items already have textures, just not ones that can be prodded by users

Like this?

That is very cool, If something like that was open to the public I think It would be good.