I can't remember - I'm using ones I had lying around for yonks. I think I probably just googleimaged them and then used "Make seamless" in GIMP if I needed to.
It's under the filters > map menu. But results are a bit hit and miss. Sometimes what I do is create a 200% x 200% tiled image, manually fix any obvious seams and then copy each side I changed back to the original image, which is a bit fiddly and time consuming but can give better results. I don't know a better way to do it in GIMP but there might be one, or maybe a plugin you can download.
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Ooh, how do I do seamlessness in GIMP? I don't think I ever learned it in Photosherp.
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