Seamless - For any pattern that may be repeated on a 3D mesh, having it semaless is just an absolute standard. Since an image texture can be "scaled" up or down upon a mesh, meaning have it repeat itself multiple times acrosss the surface of a mesh, the top of the image texture must be able to touch the bottom without any noticable, visual interruptions. Same goes for the sides touching one another.

To do this, you would use a 2D image editor, I would assume the free ones can do it as well as Say Photoshop or PSP, you "offset" the image, which basically puts the opposite edges together for you, so you can then blend those edges together with normally a "clone stamp: kind of tool. Or, with Photoshop you can also use the "heal" tool.

Here are a couple simple tutorials that explain it better;
http://blog.paranoidferret.com/?p=14
http://www.cadtutor.net/dd/photo/seamless/seamless.html

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