How do I change the "Selected Items" color?

Solution 1:

Replace the orange color in Ubuntu 11.10 (active color)

Install dconf-editor

sudo apt-get install dconf-tools

Start the program press Alt+F2 and then write dconf-editor and enter.

Path: org => gnome => desktop => interface
Find the line “gtk-color-scheme” and add this string:

bg_color:#f0f1f2;selected_bg_color:#023C88

Here it is then simply choose the color you want yourself, I have adark blue color, then just replace the last color in the string (#023C88) to change the highlight color to what you want.

More info here:
http://antecblue.wordpress.com/2011/10/17/replace-the-orange-color-in-ubuntu-11-10-active-color/

Solution 2:

Right now, there is no way to change theme colors from the GUI as in previous versions. However, if you are desperate, you can change the color values in the following files to your desired color:

/usr/share/themes/Ambiance/gtk-3.0/gtk.css
/usr/share/themes/Ambiance/gtk-3.0/settings.ini
/usr/share/themes/Ambiance/gtk-2.0/gtkrc

Thanks goes to kolinab for this.