After zypper dup, all gnome windows have a new blue style. Help!

Looks like this:

I have no idea how to reverse this, there were like a hundred packages that got installed.

Maybe this caused some problem:
I changed .gtkrc-2.0-kde4 to .gtkrc-2.0 because of some error before, but I changed it back again and nothing reverted don’t know if that was the problem in the first place.

To begin with you completely fail to tell which level of openSUSE you are using.

As one does only a *zypper dup *when one wants to change to packages from another repository, you could at least explain what (new) repo you added before you did a zypper dup.

A listing created by

zypper lr -d

might help in you explaining what you did. (do not forget to post that textr between CODE tags: Posting in Code Tags - A Guide).