Create a seamless tiled image

Step 1 - Open the image
Open the image to use for the tiling. If you need to crop or resize the image, do this before going to the next step.
Step 2 - Open the Seamless Tiling dialog
Choose Effects > Image Effects > Seamless Tiling. The Seamless Tiling dialog appears.
Perform this step for me.
Step 3 - Display tiling preview window
At the top of the dialog, the original image appears on the left, and a preview of the resulting image appears on the right. But it's usually helpful to mark the Show tiling preview checkbox to see a separate tiling preview window.
Step 4 - Make dialog settings
Based on the image you're tiling, you'll want to experiment with the Tiling Method options, the Direction options, and the Settings values to create the desired effect. Note that the Corner Style options only apply to the Corner tiling method.
Step 5 - Click OK
When you're satisfied with the look of your tiled image, click OK.
Notes and Tips:
Seamless tiled images are very popular for Web pages or as desktop screen images.
This feature simplifies what used to be a more lengthy, complicated process.

Learn More:
View a movie about this topic
Crop an image
Resize an image
Fix a photo