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On the other hand Mount Sunflower is much more customizable, with selectable backrounds, sound effects, and music. The music is a great addition, I always love to hear music while playing a game.
Mount Sunflower seems like a typical solitaire game like the one that comes in Windows.
I think Freecell has better gameplay than it.
Personally, I think gameplay is more important than the layout, which Freecell's layout is perfectly fine, and whether you can customize things.
As for music, I always just run winamp in the background anyway.
Now as for Midnight Oil, I think the gameplay is rather boring when compared to freecell.