I made a schematic and a world download of a 16 x 16 Mega Cobblestone. Minecraft version 1.21.1.
Inspired by youtuber @aonokuma. His video: https://www.youtube.com/watch?v=E42RiL84Vx8

Litematic / schematic: https://www.mediafire.com/folder/3yqpm1fq4dgj8/16+x16+Mega+Cobblestone+by+Taavut+litematic

MATERIAL LIST:

405 Andesite (6 x 64 + 21)
309 Cyan Terracotta (4 x 64 + 53)
261 Tuff (4 x 64 + 5)
200 Smooth Stone (3 x 64 + 8)
121 Diorite (1 x 64 + 57)
56 Deepslate

Feel free to use in your videos or builds! 👌