I'd like to see Crateria, where its a big platform surrounded by water, and it has to be fairly big, not temple-size, but maybe 2/3's the size of it.
Samus's starship would be in the center, and just be a platform, nothing to special about it. There could be a chozo statue and what not, and maybe like a big puddle of water to swim in.
There would be somewhat large structures, like a pillar of the dirt and rocks, like there is in Super Metroid to the right of the gunship, except not as tall as in Super Metroid.
And it'd be cool to have the Wrecked Ship far on the right, maybe acting as like a small little platform you can use to save yourself, like the clouds in the yoshi's story stage in SSB64.
But I've already got plans to make a Phendrana Drifts stage with the stage builder.
It'll kinda be in the shape of Corneria, with kinda tall snow drifts, and there'll be a long section on the bottom floor of ice, and a platform hovering above with a statue or something on it (representing a Chozo Statue, but I doubt they'd actually have one, so just a generic statue).