If you are bored with the traditional style worlds, you should definitely try this mod.
Each world you generate will be completely unique and you can fill your gameplay with extensive variety.
It allows you to generate a custom world using a huge pack of hundreds of original biomes having hundreds of custom trees, rocks, caves, dungeons, and many other things. Biome Bundleīiome Bundle is an open terrain generator mod for Minecraft. You will need Farseek API to use this mod. They originate in multiple sources and flow down the terrain through slopes and waterfall until they reach the sea. The rivers that you generate in the world using custom non-decaying flowing blocks are much larger than anything you can create using buckets. Streams is an excellent mod that allows you to add real flowing rivers with a true current into your Minecraft world. And, there are a lot of options to customize everything according to your choice. You can even add better oceans and islands using this mod.
It allows you to add over 44 new biomes, 14 new trees, a variety of small plants that are usable, 256 block high mountains, and many other things. Highlands is one more useful mod that lets you add new biomes and other areas to your game.