Assuming the texture tiles left to right and top to bottom, all you basically need to do is blur the top and bottom of the texture. You might accomplish this with the smudge tool. Blur it enough and you won't be able to see the seams at the top and bottom.
For a more professional look use a filter in your paint program which allows you to convert to polar coordinates and back. Take the image and convert it so that you see a circle in the middle of the texture with solid color around. That will be looking at one pole. Fix the texture there with a clone brush to paint over the seams. Then reverse the polar conversion, and flip the image vertically. Apply the polar conversion again, and paint over the seams of the south pole. Then unpolarize it again, and flip it back to it's original orientation. The distort filter menu in phootshop has the polar coordinate filter.
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