Mmmm... thought-provoking stuff here...
"Aqua Lung" definitely has potential for twisting and it's a song I never liked, which helps. Wouldn't you know it - that reminds of a pretty cool Jethro Tull song to do straight: "Living In The Past". Hadn't thought of that song in years and now I'll probably not be able to stop thinking about it.
Madonna already took on "American Pie" and did a pretty slick disco-ish version... good thought but not what I'm after. But Bossanova is right down my alley... perhaps a Bossanova cover of "Stairway To Heaven"? Snap!