how to change the default ugly background for gdm?

[Brian Millett]

I just can not express how much I deplore the cheese background for the GDM screen in F9. 
  I feel like I'm in a nightmare tron movie.

How is that changed?

Thanks.
-- 
Brian Millett - [ Delenn (re: Japanese stone garden), "The Gathering"]
"Notice the waves, each moving in its own order. Predictable...unchanging.
  But drop in a single stone and see how the pattern changes. Everything
  around it is altered."

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