This resource pack gives certain blocks randomized textures in game. Thats all there is to it. Those blocks are:

• Randomly Rotated Sunflowers
• Bookshelves
• Unpolished Stones
• Terracotta
• Stone
• Planks
• Mycelium
• Gravel
• End Stone
• Nylium
• Red Mushroom Blocks
• Birch logs
• Bricks
• Moss
• Cobblestone
• Grass
• Coarse Dirt
• Dirt

Some textures provided by Vanilla Tweaks