Various periodic tiles
The Wayback Machine - https://web.archive.org/web/20120820024223/http://local.wasp.uwa.edu.au/~pbourke/texture_colour/periodic/
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The Wayback Machine - https://web.archive.org/web/20120820024223/http://local.wasp.uwa.edu.au/~pbourke/texture_colour/periodic/