GNOME terminal doesn’t include very many options for color schemes and I wanted to add a new favorite of mine called Brogrammer. I found a very easy way to do this with Gogh which lets you pick from 185 color schemes.
From a terminal:
bash -c "$(wget -qO- https://git.io/vQgMr)"
Then you get the list of all the schemes available. Enter the number of the one you want and it will create a profile for you. Easy peasy.
Default Ubuntu GNOME terminal color scheme and profile:
Running Gogh to select a color scheme:
Terminal and profile after choosing a new color scheme: