FreeGameDev

A while ago I made this tutorial for the gimp resynthesizer plugin. I think this might be useful for other games too:
http://glest.org/glest_board/index.php?topic=4764.0

The thing is that this way, you don't have any control over how it will tile in the end. Resynthesizer might be a good plugin for complex structures and might get the job better done than the Make Seamless plugin in GIMP. It is, however, not the most effective method.

Thanks for sharing, seems like a good method

@sindwiller:
No this is not only meant to make tiles tilable. Tilable is one aspect yes, but this shows more. You get several different tiles which all fits to another!
If you put them on the ground randomly, you will see no more repetitions! Thats what the whole thing is about.

Look at these textures most of them are made using this:
http://megaglest.svn.sourceforge.net/vi ... /?view=tar (~221 KB)

Here you can see them in action: