I made three Spider Mob Statues at a 1 pixel : 2 blocks scale. I couldn't recreate the exact in-game color palette (brown-gray), so I made statues with three different custom color palettes: black[,b], [b]brown, and gray. I also made a a green/cyan spider that is supposed to be the Cave Spider mob. It's the closest I could get it, but it's still a stretch.
You can find schematics for LiteMatica and WorldEdit as well as a world save with all three statues in the download.
Feel free to download and use them however you like, but please give credit if you do :)
Check out my Mob Statue Collection for more builds like this!