"GNOME Shell is at the very beginning of its long treacherous
journey. As we saw in our earlier post, it is now possible to
easily install GNOME Shell in Ubuntu 11.10 Oneric Ocelot, whose
final release is scheduled to happen next month itself. Meanwhile,
I have been using GNOME Shell in Ubuntu Oneric beta for sometime
now and one thing I am really unhappy about is its default theme.
But third party GNOME Shell themes are already pouring in. Here is
a collection of top 10 GNOME Shell themes(installation instructions
towards bottom of this post)."