I use tilesets based off of this tileset for quick prototypes and stuff, thought I'd share. These are based off this tileset's stone and dirt, along with the grassy variants, and made to work with Godot's 3x3 autotile template. The tileset also contains a custom ceiling tile and derivatives, as well as a "stair" variant for smoother terrain in the last two columns. (Last two columns are optional and not part of the main template, if used as an autotile, for the stairs use the same bitmaps as corners)

CC0, feel free to use