The EEK! Mod is a fantastic mod if you're looking for something new but true to Minecrafts core,adding a new creature called the eek, which when hit, will let out a gut renching EEK! Letting all other eeks know of your presence, it adds its natural habitat, the huuderoo biome, and even a fire flower, which will illuminate the night, and one more thing... A MINI GUN!
I have a YouTube channel that does mod videos called Sk8r Gamer if you want to check it out!