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Multiple axes of symmetry, to allow things like (x2, y4 reflections):
..X.. .X.X. XX.XX ..... X...X ..... XX.XX -
Generate SVG strings instead, and render them with an external library.
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Color-transform callback, which is passed the "colors" array, and must return a "colors" array. Useful for nudging colours away from low-contrast pairs, maybe desaturating, etc., to provide a more uniform look.
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Allow null for foreground colour, to delete background and allow transparent
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Allow pluggable hash functions
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Change "pixel" references throughout source to "tile"