My gut reaction is that you are thinking about it too much...your messages are always articulate and delivered with feeling...why not just jump in with a nice original tune in mind, and see what happens?

Having said that, I've always liked the metaphors in the jazz tune Midnight Sun (Your lips were like a red and ruby chalice, warmer than the summer sun...The clouds were like an alabaster palace, rising to a snowy height, each star its own aurora borealis...etc.) It's a simple melody, just a descending scale...

BTW, Alex...I've never heard Antarctica but the lyrics are great.