You can easily see the way the texture tiles though. Here's what you can do to fix that.
Okay, there are a few ways of doing this.
One (not the best, but it works): Copy a chunk of about 30 or so pixels from the left side of the texture, copy, paste, flip it, and line it up on the other side, but now you have a line there that you can easily see and you have to get rid of now! So use clone stamp or the healing brush to massage it in and you should have a better result.
Two (much better): If you own photoshop, go to filter -> other -> offset and offset 50% of whatever the dimensions of your texture is so the seam is running down the middle. Now that it's there, use the healing brush to blend the seam together. Use offset again to put everything in it's place and wallah, and really nice seamless texture. This is an awesome way to do it and is used in the industry quite often.
Not directly related to gaming, but just in 5 seconds of searching I found this as a point of reference:
http://www.cadtutor.net/dd/photo/seamless/seamless.html
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