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I believe it was created in the first moments of the Big Bang, and therefore originated fairly evenly from all points in the Universe at once. So to ask where it came from is like asking where the Big Bang occurred; it happened "everywhere".
I suppose what I'm really trying to establish is the location of the source of the photons we receive now in the COBE or WMAP telescopes. They would have been sufficiently distance to allow a travel time of 13.5 billion years but as the space between us and the source has been expanding I am assuming that they will have travelled from a distance which was much less than 13.5 billion light years at that time in history, just post big bang (after 350000 years, its all relative!).