I've been working on a Mario 64 Rom-hack where everything is fantasy based. I'm about half-way done with it. I have some screenshots to go along with it.

First level, completely food based.

Yoshis house from SMW

Forest of Illusion also from SMW

Bowsers Burning Blocks

Captain Toad Level, Koopa the Quick race.

Luigi Cameo

Growth Gardens

Icicle Islands

Weary Waters

Sunken Ship in Weary Waters

Lily Pad parkour in Weary Waters
So those are the levels so far.
--Other Changes--
No fall Damage
No 100 coin stars
I still need 7 more level ideas and names (Names must be alliterations)
I hope to get this project out by the end of summer!