One of the first things in new installed,or reinstalled ubuntu should be customizing your own gnome desktop,and you would like to change foreground and background color of gnome panels,icons,menu,and so forth.
Gnome color chooser is a tiny tool with graphic interface that you can easily change your ubuntu gnome desktop,panels,menus,active windows colors.
You just need to type this command in terminal to install this:

sudo apt-get install gnome-color-chooser

Then launch the program from System->Preferences->GNOME Color Chooser,and in following screen customize your own colors and click Apply
gnome_color1