Using the Magic Wand select the area you wish to fill.
Click on the Foreground Color box in the Materials Palette, and Click on the Pattern tab. From the drop down, you can select a pattern or graphic. If your graphic is in another file, you can open the file before you do this, and it will appear in the drop down, as a selectable pattern.
You can set the angle and the scale for the graphic. and then using the Flood Fill tool (paint bucket) click on the selected area to fill it with the pattern.
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Ignorance is not necessarily Bliss, case in point:
Unknown has caused an Unknown Error on Unknown and must be shutdown to prevent damage to Unknown.