A rip of the forest and/or underwater tileset from the Super Mario Bros. tileset of Super Mario Maker 2. It includes all four forest variants (including proper Layer 3 versions), decorations from both tilesets, and Layer 3 water.
It's recomended to use a Sprite Status Bar patch for best usage of the Layer 3 backgrounds. Credit would be appreciated (as this took me a bit more than usual rips) but not needed.
Updated again (sorry, please re-download) to add proper Layer 3 version of the backgrounds, so people now can use FG in Layer 2 if they want (at the cost of not using water, of course). This tileset is now the most versatil it can get, I guess.