{I just make the tilesets, other assets are made by Matias [https://mfgg.net/index.php?act=user¶m=01&uid=15896], other members of the MM community or Nintendo.} Not my favorite, but still high on the list.
I made this theme for a game, you may of heard of it? It's called "Mario Multiverse". Anyway- I think it came out pretty well. (There's also plenty where this came from.)