I was thinking about mapping out an island.
Like, a really nice one. With secret areas, and such.
Think Lost or any other movie where survivors are stranded on an island.
//edit
I also have a new auto program that will make note-block loops wherever I want with minimal space. 5x2 for each note to be exact.
Example of the Clock Town Theme from Majora's Mask
http://www.mediafire.com/?63wo5wsn830n4v0If I was to put this in-game, it'd be only 5x20 c: Easily fit under spawn.
Keep in mind, I can do this with ANY song. I was planning on having a switch right outside of spawn, and when someone hits it, you get rick roll'd.