Here's a map I threw together - you'll need two sets of maps to play this one.
This would be a good scenario for a four player game. Each player gets two of the outer maps, a corner and one next to it.
Here's another one . . .
This would be a good four player game where each player gets one of the "middle" maps and then everyone scrambles to get the middle and the sides. Going first would be a big advantage!
And another . . .
And still another . . .
Isn't it amazing how that one coastline looks so familiar . . .
Here's a 4 piece map for a larger game for two players.
Here's another one:
Here are some possible combinations with the original four maps in the set.
Is this all of them?