Here is a theme Kingdom I came up with a while back that is pretty interesting gameplay-wise, and only requires cards from Intrigue, Seaside, and Hinterlands. I've played it some against bots, but I'd like to know what the forum thinks:
Desert Journey
Provinces/Estates
Crossroads, Oasis, Caravan, Nomad Camp, Silk Road, Spice Merchant, Bazaar, Highway, Trading Post, Harem
Which cards are relevant? When do you want to get them? What sort of general deck type are you going for?
Is there an optimal pure strategy? Is there a rock-paper-scissors thing going on? What do you need to look for in what your opponent does?
What do you open on 4/3? on 5/2? Does your opening split affect your strategy for the game? How does Nomad Camp affect your opening?
Can you pull off a megaturn? Can you do it before a non-megaturn player builds an insurmountable lead?
How do the two alt-VP piles factor into things?
What does the endgame look like? Will it end on piles or Provinces?
How does all of this change in multiplayer?