how to change the yellow background color?

[黄叶]

Hi, All
I have a question,  I don't  like ubuntu yellow background,  so, I had use
some theme for change
the gnome desktop, include the background image, and the window manager,
and had changed the gdm theme.

it seem ot all tings is ok.
but I found one background  is yellow still.
that background is show after I had inputted the username and password,  but
the gnome splan not begin,
this background is yellow still.
it is X Server background ?

how to changed this background color or image I like ?

thanks very much.

Mike.G
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://lists.ubuntu.com/archives/ubuntu-users/attachments/20071024/0f5ba9e1/attachment.html>