I'd say if you're taking requests from the community, I've got one to help the water make more sense in a way:
For a high quality mode, the water's color would be changed by sampling colors above it and around it every few frames or so, then adding the color pigment of the biome partially, sampling the colors above the water would be more important, for example, if the player was on the surface next to water, the water's color would adapt to the sky and clouds, emulating reflections without destroying the framerate, it's also possible that it could sample relative to the player's position on the screen.
Also, is it possible that this could be applied to slimes in a way to make them feel more slimy?