None.
I think this was mentioned some time ago in earlier threads/posts, you CAN'T, I repeat, CAN'T change the terrain with an Extended Unit Death Trigger. 

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Symmetry -- I might try. Never touched them when I was younger but could be fun
Symmetry -- https://www.youtube.com/watch?v=OgLecsPyObI doesn't even look like a starcraft map at all
Symmetry -- I was looking at some maps for reference and the stuff that gets put out is insane
Ultraviolet -- I enjoy the retro feeling maps that give off a 'made in Staredit' vibe lol
NudeRaider