Part of me just wants to make a boatload of stamps. I think the current map generator is a bit lacking to be honest.
Regardless, the game is still new. I'm sure large compilations of stamps and custom units will pop up eventually. Probably not until the first couple updates have been release and the bugs have been ironed out though.
Wasn't there an option in WoM to connect to a database of sorts and download custom maps, or am I making that up?