Adding these to the list of future possible themes:
Magic: The Gathering: Creatures, objects, spells, and more inspired by the game.
{ Suggested by Mecheon }
Baldur's Gate and Offspring: Content from the beloved games of the past, be it the Baldur's Gate Series, the Icewind Dale Series or Planescape: Torment. Help recreate some of the nostalgic flair of the incredible artwork of the best RPG games that captured our imagination for hours on end.
{ Suggested by Snugglehoof }
The Art of War: Military and Battlefield PLCs, Seige Engines and Weapons, Soldiers, Officers, Commanders, Support, New Combat Related Animations, Tents, Barricades, Fortifications, Defense Improvements (Murder Holes, Archer Slits, Boiling Oil) or anything else related to Modern or Historic warfare.
{ Suggested by Carcerian }
It came from Outer Space!: Outer Space, be it Mystic Spelljammer or Soft/Hard Science, including creatures, craft, destinations and discoveries.
{ Suggested by Carcerian }
Far Realms and Beyond: Flora/Fauna, landscapes, and any other material from the outer boundaries of reality, be it the planes beyond imagination, chaos realms, dreamscapes, nightmare lands, twilight zones, or any other impossible worlds beyond the comprehension of mere mortal minds.
{ Suggested by Carcerian }