alright, just disregard the following post I'm about to make... I've had a few things in my head the past few days and I want to get rid of them, so just ignore them if you don't find them interesting.
I've seen some mods that add more types of villages or villagers, but I haven't really seen a mod that add different kinds of villages and villagers. they often follow the vanilla generation or the villagers are human, but what about a mod that really adds all kinds of villages and villagers. for example a village deep underground with goblin type of villagers and houses that look like caves. their trades would be related to mining or minerals. or a village in the nether with zombie pigmen villagers, the villages would either be hanging from the ceiling like some sort of tree village, or floating in lava lakes with most houses being in the lava. these villagers would offer you quite a few enchantment trades and nether resources, though if you anger them the whole village will come after you. or a village high up in the sky in the clouds, with perhaps some sort of ghost-like villagers. these villagers can offer you very rare trades and they've alot of knowledge, so their houses look alot like temples.
the current mods that feature villages or villagers don't stray away too much from the vanilla villagers and villages, so seeing a mod as I described would be very interesting, and also very awesome, to see all kinds of villages in the world with their own kind of village generation.
and I don't often play on servers, but if I were to play on a modded server it'd be pretty awesome to be able to take some kind of tour around the server, where you're able to find the best location for your base.
not this is often done by using minecarts or by using railcraft, or people simply just teleport, but I'd find it pretty fun if there was a mod that'd add some sort of tour vehicle you could ride around.
it'd work similar to minecarts, where you've to lay out a track that the vehicle will follow. because you're using tracks, the vehicle would probably be some sort of touringtrain. when you've layed out the tracks, you're able to create stations at certain locations. when the stations are made, you can place down the touringtrain and depending on whether you're in creative or not, you can configure the touringtrain in certain ways. when you place it down in creative, you can either require people to pay for the ride, or allow them to ride it for free. you can also set so the touringtrain will require fuel or not. you can also make the train follow a certain schedule, so you can keep it going around the server, passing by stations, picking up and riding around people. you could also allow people to create their own trains where they're able to ride to stations, but these would ofcourse require fuel.
now this could be done with railcraft, but rather instead of using minecarts this mod would add an actual train model instead of minecarts. the train can also have several wagons, increasing the number of people being able to ride in it. when you board the train, your skin doesn't actually show up inside the train, this is to prevent that buggy player sitting model going through walls and such. you could however have a basic model be added inside the train or wagon when someone enters it. when you board the train, you don't actually see the inside of the train or wagon, this is to prevent a buggy view aswell. you can however look around as if you'd be standing in the world yourself
though Traincraft might be the kind of mod I'm talking about, however I never played with Traincraft before so I'm not sure if these kind of things would be possible.