Water in snowy biomes is now freezing! Don't fall in or else you'll get the frostbite effect as if you fell into powder snow. This is configurable and goes well with Thin Ice.
Particle Effects
Ice blocks make drip particles
Leaves blocks will have falling leaf particles
Grass, Dirt & Farming
Grass turns into paths from being walked on. Note: this is disabled by default.
Using Flint on Grass Blocks will turn it into Dirt, and on Dirt will turn it into Coarse Dirt
Composters produce Dirt blocks as well as Bone Meal