Cool! It would be great to also get models for them.
I don't have that kind of experience, but theoretically, I think that if you follow the following algorithm, you can fill many artworks with individual appearances. I'm even laying the groundwork for this in the icons and names, as I might try to implement my theory in the future if possible:
Let's say "Sword of Justice" looks like an archangel's blade:
1) Get the creature model.
2) Load it into a 3D editor.
3) Cut off only the sword.
4) Without changing the geometry or UV mapping, export it from the 3D editor.
5) Load it back into the map editor.
6) Apply the archangel's texture (since the UV mapping hasn't changed, the sword should get its own coloring).
Done.
That's roughly how I imagine this process.