This value tells browsers to make the image repeat across the page and down the page to produce a grid effect. Delete that statement if you don't want your GIF to create a tiled background.

Open or create your OpenOffice Writer, Calc or Impress document. Click the "Format" menu and click "Page." Click the "Background" tab and select "Graphic" from the "As" menu.

In Google Docs, you can add watermark, picture and solid color background to your page. Learn how to insert Background Images in Google Docs.