I'm almost certainly going to try and land a Lords of Magic based mod. (Not one that repeats the actual game, though, more like a mod based off a theoretical sequel to the game.)
I also have a vague idea of how a multiple map system might be used in a space empire mod, which I might use to try and do a MoO3 based mod. (MoO3 is the only MoO game I've played, plus it's a chance to do it in a way it could/should have been done, not as it ended up being done.)
I haven't started threads for these yet, though, since the game still doesn't work for me yet and I have almost no idea of how the mechanics currently work. (I do have a lot of general ideas for what I'd do, but seeing elemental's mechanics will be useful for coming up with specifics.)