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Okay, I think this is approximately what I had in mind for the spa Elite 4 room.(I read spa, and thought hot springs, which is I guess sorta similar?)
I was going to use some darker sand in the middle, but there isn't really any. There also isn't an inside corner piece for the spa. Nor could I put a ladder on the side/front to get out of it, although that doesn't really matter.
Also, I used a cave exit for the entry because I couldn't figure out how to put a door on that side (also, couldn't access much with that tileset?). I figured that the exit would be on the right side there (couldn't find any sort of door to use there, though), and if need be, a corridor outside could then turn to whatever direction the next room started from.
Also, imagine the whole room covered with that bright fog/mist (I think it's used in Flannery's gym?) for steam.
Sorry it looks like shit despite spending 3 hours trying to make it look right