Hello and welcome to this new GUI !
I'm so happy to upload this one, that is inspired by the latest snapshot (25w02a). It's full light brown and brown, with some autumn leaves that I picked directly in the game.
The original pack is made for Java 1.21. If for some reasons, you need to use it to play with more recent versions of the game, you can dezip the file, open the "pack.mcmeta" document in a text editor and edit the number after "pack_format":.
For Java 1.21, it's 34. For Java 1.21.4, it's 46. (For the 25w02a snapshot, it is 47.)
You can find these informations on the minecraft wiki with this link.
Don't forget to save the changes and re-zip the file before putting it back in the resourcepacks folder !
Thank you for playing with it, I'm looking forward to getting your feedbacks !