Bliss SMP is a survival multiplayer server that just started. It is semi anarchy so it feels a lot more wild and free than normal.
The main twist is gems. You can pick a gem you want or you can let it give you a random one. It makes the start feel exciting since people can end up with different stuff.
If you want an SMP that is chaotic but still has a clear fun idea then this one is worth checking out.
