A little while ago I decided to enable Google Apps for my domain for Email use. It’s free, I can easily access my mail from anywhere, and if I change web hosts I don’t have to worry about backing up my mail.
But one thing I had missed with Gmail under Google Apps, compared with normal Gmail, is the ability to apply themes to Gmail. I had read somewhere that the theme setting would appear automatically after an undefined period, but was this was wrong.
If you want access the themes in Gmail under Google Apps you need to log into Google Apps for your domain, and go to Domain settings. Then under the General tab, check “Enable pre-release features” and save the changes. Wait 20 minutes, or so, log into Gmail and you should see the themes tab under the settings.