Is it possible to apply any themes to improve the appearance of Evolution?
If so, how? I think the progress of Unity makes Evolution look a bit dull, and would like to spark it up.
Evolution uses the same theme as your other desktop applications but it will probably look as dull as it is now. So you are out of luck there.
To make this worthy answering I can advise on some cool themes made for Ubuntu 11.04 that also adjust evolution. This will install 3 themes:
sudo add-apt-repository ppa:tiheum/equinox sudo apt-get update sudo apt-get install gtk2-engines-equinox equinox-theme sudo apt-get install faenza-icon-theme
named Equinox Evolution Dawn, Equinox Evolution Dusk and Equinox Evolution Midnight and a Faenza icon set that go with it.
(dawn is another light version of this)
But basically it is the same layout with the same icon set and another color.