Originally this was just going to be Boo Manor, but then I realized how little there is to work with on that theme when you get right down to it. So I added in a bit of Riddle Tower (which sadly doesn't actually have any Boos in it).
I think the two go together fairly well, and I think this remix turned out fairly well.
Spat, Ghost Ham, Boo © Nintendo(?)
Original themes © their respective owners
Remix, artwork © VibrantEchoes