Just a matter of starting a new file. The file dimensions are determined by the watermark size and the spacing between watermarks. The larger the text/image the less marks there will be on page ... the more space around text/image the further away from each other the marks will be, change background to a layer and fill with a solid color, creating a second layer for your text/image (gif with transparent background), add effects to text/image (optional), lower opacity of both layers (each can have a different opacity. You need something around 10-15%), crop if necessary, Select - All, Edit - Define Pattern. Start a new file. Edit - Fill, selecting Pattern from the Contents Use: drop down menu then choose the pattern you just defined from drop down menu. This will fill your new file with your watermark tiled over page.