I'm following the instructions on this page:
sudo add-apt-repository ppa:tiheum/equinox sudo apt-get update sudo apt-get install gtk2-engines-equinox equinox-theme
But I'm getting:
E: Unable to locate package equinox-theme
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Equinox is not available for 11.10, and it will only show up in the PPA for 11.04 and below.
The reason it is not available is because the entire equinox engine would need to be ported to GTK+ 3.x, which is not a trivial matter. It will probably be a while if it ever happens at all.
I believe this may help you: http://www.linuxnov.com/equinox-theme-with-faenza-icon-theme-how-to-install-on-ubuntu-11-10-oneiric-ocelot/
Let us know if it worked!