If you need need any help, I can texture or make models for ya, but here are some ideas I had floating around in the brain that I either have no time to do or just thought and never worked on it
Space Kingdom, with Fishbowl Helmets and Alien Goblins
Cave Kingdom (With Biome) Live Underground and never see the day, skins have whitened and eyes have dimmed a lot
WW2/WW1 Trenches, Bayonets, Grenades, and Enemy Goblins
Apocalypse Kingdom destroyed, gone, where else to live in the wasteland of the world?
Candy Kingdom, Chocolate Swords and Black Licorice Goblins
Cyberpunk Kingdom, Virtual and Tech based, fight robo Gobs V3.0 whilst feeding RAM to your Robo-Humanoids and VPN's (Virtual Poyo Networks)
Pirates, thats about as far I as I got, NEXT!
FOOD FIGHT!!, like Sausages for weapons and because French Knights was too good to pass up.
Thats about it, feel free to use or contact for help.