How to change linux text area background color?

Hi,
I like to know the method. just like in windows platform.

Just like change the text area color in notepad.exe
so i mean X11 and gnome.
do you mean inside a terminal when you're running X
No, i can change the color in gnome terminal.
But i can not change the color in openldev(or any other gtk apps)
I hate the default color(white),
want text background color as grey, without configure each apps color.

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