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Well, I've tried a few more ridiculously abstract forests ... polka dots! I think this might actually work. Now to make a pattern for the marshes, grasslands, tundra (moar tundra!), ice (blue polka dots! ) .... oooh, maybe I should make little traingles for coniferous forests and mixed triangle - dot polkas for mixed ... yess ...

forests (3 types), tundra, marsh, grassland, ice, sand/dirt/barren ... hmmm what else do I need?