This is a grassland tileset from SMB. from SMAS., from levels like 1-1 and 2-1.
Please give credit if used.
This is overall really well done, but the Map16 could really use better organization. As of now, it imports a big number of default tiles, so you should put the tiles more next to each other to avoid that. Arranging them together so you can select multiple tiles for big objects was fine though. Also, it'd be nice to include exit-enabled tiles for the pipes. That's good courtesy for hacking beginners who have trouble setting up Map16.