How to Create Images that Seamlessly Tile

Selecting Your Image

Cropping your Image

Any even number size (300px by 300px.)

Square marquee tool

Hold down shift, and drag and select crop.

Offset Filter – under “Other”

Select wrap around in the "Undefined Areas" box

Divide width of image by 2 (300=150)

Enter into the horizontal and width boxes

Click OK

Patch tool (Clone and or Healing brush)

Remove noticeable seems

Alt+Click