Well this is not exactly the first time copyrighted textures have been discovered in your mods. You really should look over the source of where you get your textures because now that we have more attention towards Minetest, it does not give a particularly good look that one of the top modders steal Minecraft assets for their mods.
Anyways the changed textures look fine now, so approving.
I was going to fill the rest of this with a rant about texture similarity to notchian planks but since a) the issuer never said that and b) they aren't based on notchian planks it went in the bin.
except why use 32x textures. just, why.
PS: Noticed a small bug in dirt.lua, it appears like ethereal:quicksand is deprecated and should be replaced with ethereal:quicksand2, but I don't see the former having the not_in_creative_inventory group, so unless it's being added elsewhere someone could pick it up by accident. Why did I care enough about that microscopic detail to bring it up I don't know.
@FavoritoHJS - Will check quicksand issue and fix, as for the 32x textures - I liked the detail it gave and some of them took ages to make so I'm quite proud of them, but easily replaced by texture packs if needed.