How to make selected tab in terminal more prominent

For 12.10–15.04 you can create a CSS theme for GTK 3.0 as explained in this comment by Kees (kees-vanveen) on the bug report posted above by Alessio.

Paste this as the contents using your desired color:

TerminalWindow .notebook tab:active {
    background-color: #def;
}

I'm not that much of a theme hacker, but here's a quick fix:

Create or edit the file ~/.gtkrc-2.0 to include the following:

style "gnome_terminal_notebook"
{
  fg[NORMAL] = "#00ff00"
}

widget "*TerminalWindow.*.GtkNotebook*" style "gnome_terminal_notebook"

This will turn the text color of the active tab green. Not very beautiful, but should give you a start.

You could also lighten up the highlighted tab by replacing the fg line with:

bg[NORMAL] = shade (1.25, "#3c3b37")

The downside: this will also make the inner borders brighter.

Note: This will influence every theme you choose in the appearance properties, so don't forget to undo those changes when using another theme.

Using Ubuntu's warm grey in https://design.ubuntu.com/brand/colour-palette, this is a small variation of David's:

TerminalWindow .notebook tab {
    background-color: #e2e0dd;
}

TerminalWindow .notebook tab:active {
    background-color: #f2f1f0;
}

The color of other tabs here is slightly darker.

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