A few days ago I had been upgrading my OS X with a fresh install, the default theme in terminal is very poor if you work with the console, to change the theme you can configure the colors.
First, edit your “~/.bash_profile“, if don’t exists create new one, and add this content:
Now, you can download a preconfigured themes from:
Select one and open it with double click (files with “.terminal” extension), now change the terminal preferences, in Profiles section select your profile and set as Default.
I use the Nova theme in my laptop: