There's no such thing as a "Ubuntu theme." You want one (or more) of: GTK+ theme, bash command prompt configuration, KDE theme, GNOME theme, fluxbox/blackbox/etc theme, Xfce theme, ....
Ubuntu by default uses GNOME (which, in turn, is based on GTK). As such -- and assuming that you are, in fact, using GNOME -- I'd suggest googling around for those. art.gnome.org and freshmeat.net (themes.org was rolled into fm a few years ago) are both decent starting points.
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