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Recolors most of Regions Unexplored's biomes water to be a softer blue. Not all biomes have been covered. Goes best with Retinted: Vanilla Waters. The water colors from this resource pack might look off without it.
Check out the Gallery for pictures.
Polytone is a mod that allows resource pack creators to edit more things than usual, like water colors. I have also heard that Optifine works but I have not tested it.