Lush Caves with better "snow" and the LambdaBetterGrass Default extension resource pack. Credits to cavebiomes by SuperCoder79 for the lush caves generation.
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It's literally pack.png
Standard better snow, adds a snow layer to some non-full blocks like fences, a lot of plant-like blocks, etc.
Better grass with Nether Update
Better grass with Fancy settings, side textures are smoothen.
Better snow with the Default extension built-in resource pack.