This is a mod-pack I have been working on for a while. It uses a lot of mods that I felt made the game really realistic. It uses mods like dynamic trees and if you want the actual earth, use the terrarium mod.
-Millenaire (adds realistic, detailed villages)
-Animania (adds animals and improves animal behavior)
-Better foliage (adds extended textures to leaves, grass, and water)
-better portals (see-through portals without loading screens)
-Biomes 'o' plenty (lots of biomes)
-MrCrayfishFurnitureMod (furniture)
-Creeping nether (makes nether appear in overworld from portals)
-DynamicSurroundings (adds more ambient sounds and improves footsteps)
-BetterFPS (performance improvements)
-DynamicTrees (makes trees look and act more realistic) comes with BOP compat
-FamiliarFauna (adds deer and other animals)
-JEI (recipes and utilities)
-JourneyMap (waypoints and real-time mapping)
-MalisisDoors (better doors and gates)
-Quark (improves caves and adds extra features like pirate ships ;)
-SereneSeasons (adds changing seasons)
-SoundFilters (improves sound physics, ex: caves echo)
-Streams (adds realistic flowing rivers
-terrarium (1:35 scale replica of the world) (configurable)
-MrCrayfishVehicleMod (adds vehicles like cars)
-weather2 (adds storms, tornadoes, and hurricanes)